Major Plumbing Drain issue

So what started as a simple drain snake on 5/10. Turned into multiple backups into my kitchen sink.
Today the associations contractor XXXXX XXXX Sewer jackhammered 12 feet of concrete in my unit behind the kitchen sink and found a collapsed loaded with junk pipe.
This is a common area pipe that runs to the mainline and serves more than 1 unit.
Good thing over the weekend I moved my water heater flood sensor to the kitchen sink, This is what is saving me and my neighbors from flooding in my unit and others. Thankfully it is tied into my alarm system and if I am not home a relative 7 minutes away can be here.
They replaced that section and sent a camera down to look further and there is another section that is damaged and leaking 20 feet away from the repair.
So more jackhammering being done as of this post. An additional 20+ feet is being busted up now as I write this post.
This drain line does not affect Bathrooms.

I am on the board I would like some input here if we should file a insurance claim through the master policy or dip into our reserves which we have a fair amount in there. We would have to postpone other projects planned for this year.
We do have a line item in our budget for misc. plumbing but that won't be enough given the situation here.

First, read your policy (or ask your agent) if the policy covers collapsed pipes.

If it does, then find if the cost of the repair will be more then your deductible.

If you do file a claim, make sure there are pictures of everything (get them now).

This is an operational issue and should be paid out of the operating account, not reserves. Just because the budget didn't budget for this expense, doesn't mean it automatically is paid out of reserves. You may borrow from reserves to pay the bill, but you need to have a plan to reimburse reserves over the course of say a year.

Depending on the amount of the claim, I would check with the insurance agent if the damage is a covered item and if is it worth filing a claim.

Our policy covers backups. No mention of damaged or collapsed piping.
Emergency repairs are still ongoing.
Lots of pictures and video taken.

Then, as others have said, time to talk to the agent and see what will and what won't be covered by the policy.

This way, the board can make an informed decision.

Typically, cast iron pipes should last 50 years or more in the ground.

If you are having failure rates at 35 years, you may want to add this to your reserve study.
Use these bills as a basis for how much to put into the reserves.

You may also want to start a camera inspection of the pipes every 5 years or so.

Yes, they should last 50 years, but agreeing with Tim, and the reason I asked if they were on your study is that it's probably time. Our condo high rise is 22 years old and last year, at the advice of our reserves specialist, we added a line item for drain piping inspection. In your case you might want to add two line items: One for drain line repairs and another with a longer Remaining Useful Life: drain line replacement.

Update 6/24/23
This is taking a while but our Master insurance company did send a agent to take look at the units affected.
The cost of replacing things on my end are over 9K.
This does NOT include the work to replace the pipe and the jackhammering and so on.
Waiting now on carpet and flooring companies for quotes to submit.