Heater & A/C

[rbr]

Hi all-
I have a couple of minor problems with our new-to-us 2004 Safari 28, generally in near-new condition. The heater lights only very reluctantly after many time out failures, and then the flame sounds like it is sputtering and popping rather than a steady healthy roar. Propane bottles are full and all other gas appliances work fine which I presume rules out air in the lines or pressure issues. The vent fan runs fine and no insect/rodent detritus can be seen in the exhaust vent, nor is there any untoward stench from the heat exchanger when it does light. How do I check on a valve or burner orifice problem, or is this now an issue for the repair shop? The other problem is the fan motor on the A/C, the bearings are too sticky for the motor to start by itself, but will turn and run w. a manual push. Are these sealed/replace-motor-only types or is lubrication possible (hopefully from below)?
All ideas welcome, I am a 3-4 wrench level do-it-yourselfer with all necessary tools.