Just use a little sense and at least ask your propane dealer what they would charge you to fix it. You might be surprised how reasonable it would be. I've repaired furnaces since 1970 and that's what I would do.
Don Ford
2004 Safari Trek 31SBD (F53/V10 20,500GVW)
'09 HHR 2LT or '97 Aerostar MiniVan (Remco driveshaft disconnect) for Towed vehicles
BlueOx Aventa II Towbar - ReadyBrake Inertia Brake System