About 9 years ago, on the start of my second year with my still "new" Ollie I stopped into a donut shop in Rock Springs, WY. Upon getting back to the Ollie I noticed that my fridge wasn't working. Luckily, there was an RV repair shop just down the street that agreed to help me even though they were VERY busy. Fifteen minutes later I was back on the road but not until I had a chance to ask just how they fixed the problem so fast. The tech told me that bugs, dust, and debris of all sorts can land on or "foul" several things in the burner area. The solution for this is to carry a can of compressed air in order to simply blow that stuff away even without having to remove any parts. The only warning he had for doing this was to never direct that canned air flow into the burner jet orifice.
So, given the dirt roads I often use I've needed that compressed air more than once - don't leave home without it!
Bill
p.s. it is best to purchase a can while at home - there are several locations I've found where compressed air (if they have it) is held behind locked doors. This is apparently due to some people inhaling what comes out of these cans in order to get "high", therefore, local ordinances have restricted sales.