Way to go!!
I find with most RV repairs there is a certain level of neglect that has caused the problem. Not saying the owners are doing anything bad, just that an RV sits most of its life so out of sight, out of mind.
Thing like the wires that are somewhat loose work while using the coach then when it sets corrosion can start then you have a bad connection.
Brakes, water hoses, etc. do the same thing.