[particlewave]

It is a common issue with the 2005 987. Static buildup from wiping the headlights with a microfiber cloth can cause issues or even fry the front control unit.
He can try unplugging the unit for 5-10 minutes (disconnect battery first) and/or having the code cleared, but there's a chance that it needs to be replaced (around $500 for the part).

I would also add a static discharge ground connection to prevent it from happening again.