Howard,
I'm not sure what your calling an unexpected repair.
Depending on what you are calling an unexpected repair, Wisconsin Condominium laws,
703.18, specifies that
"Unless otherwise provided in the declaration, in the event of damage to or destruction of common elements of a condominium, the association shall promptly undertake to repair or reconstruct it to a condition compatible with the remainder of the condominium. All cost of the repair or reconstruction in excess of available insurance proceeds shall be a common expense."
Reserve funds are typically for the expected maintenance, repair and replacement of capital components and are addressed under Wisconsin law
703.163. Depending on what the unexpected repair was, it may or may not be proper to use the Reserve funds and make adjustments to correct the new life expectancy.
Examples:
1)You budget in the reserves the need to power wash the community buildings every 8 years.
At the 5 year mark you discover that planning to power wash every 8 years wasn't correct and it should be every 5 years. You should then power wash the buildings and adjust the amount set aside into the Reserves so power washing can be done every 5 years.
2)You budget in the reserves the need to power wash the community buildings every 8 years.
At the 3 year mark the complex was vandalized and you need to power wash grafietti off the buildings. In this case it would be permissible to pay for some of the cost of the power washing from the Reserves (the amount set aside for the last three years from the last power washing) and pay for the balance from the operating budget, contingency fund or through a special assessment.
3) You do not budget for power washing in your reserves.
Anytime the power washing is needed, it would come out of the operating fund, contingency fund or a special assessment.
Hope this helps,
Tim