Grand Hall Enterprises (NHTSA 01E014) Recall of 66,000 propane regulators manufactured between 1/96 - 12/99
Certain model 6000 automatic change over regulators, used with propane fuel, contain two rubber diaphragms in which the second diaphragm can tear under pressure, resulting in a propane leak, and possible fire in the presence of an ignition source. Recall fix: return of regulators to store of purchase for a replacement regulator free of charge.
May take a little digging but, there's ton of useful info on this link:
http://www.rvadvice.com/main.html
ciao