In an older MH it is rarely repair and replace. Secondly if something fails why just replace it with the same type of part that failed. Case in point broken plastic parts get replaced with steel, Al or wood. Parts that fail all the time like the Trimark door assemblies I replaced the Zinc alloy latch with steel. When my Kwikee steps would not work do to a bad controller, they no longer sell a control board for a 23 year old MH and Kwikee wanted me to but a whole step assembly. After some research I found a relay burned out and replaced it for $3:49. There are a lot of people on this forum that provide incite on how to fix complicated problems with RV systems.