I have found good information at http://www.pbpipe.com/
my reading of below would indicate that there is nothing that can be done for homes currently if the pipes were installed before 1989. Check for yourselves though.
DWELLING AND POLYBUTYLENE PLUMBING SYSTEM FITTING TYPE: ELIGIBILITY PERIOD
LEAKS MUST OCCUR WITHIN: FILING DEADLINE
CLAIM MUST BE FILED WITHIN:
Mobile Homes - Any combination of plastic or metal Insert Fittings 10 years of installation 11 years of installation
Yard Service Line - Any type of fittings 10 years of installation 11 years of installation
Homes - Plastic Insert Fittings 13 years of installation 14 years of installation
Homes - Metal or Mixed (both Plastic & Metal ) Insert Fittings 16 years of installation 17 years of installation
Commercial Buildings - Plastic, Metal or Mixed Insert Fittings 13 years of installation 14 years of installation