You need a licensed electrician that can trouble shoot. 

Even troubleshooting.

My husband does appliance/plumbing/boiler/electrical repairs, turns apartments, does inspections, deals with contractors, and troubleshoots on a regular basis.

I work with my hands and my brain day in and day out, fixing, installing, troubleshooting, you name it.

For plumbing/HVAC I use Mat's Mechanical exclusively (water heaters, furnace trouble shooting, etc). 

As an expert witness and troubleshooter in the MH industry for over two decades I can't count how many cases I've been retained on over management harassment and bullying issues as well as MHC neglect and maintenance or lack there of.

:https://www.biggerpockets.com/forums/52/topics/680...Without providing a laundry list, I think the theme is to tackle the wear points and troubleshoot the individual unit.For example, start at the door (door mat to catch debris, good functioning new lock, perfect close and open, door stop) and work through each room with that level of detail ( example: Bathroom: new shower curtain, bath mat, caulk, new toilet flapper or overhaul kit inside, strong towel bars, etc.)I would focus first on the low cost items that can prevent larger problems (your doorstop type theme) and then also evaluate any larger item close to the end of its useful life, especially if showing signs of problems (be it hot water heater, worn flooring, or an appliance). 

I built a network of friends and contractors that I can call to trouble shoot anything I cannot from a distance.

Moreover though, I like helping folks on subjects I know about and Manufactured Housing has so many complicated areas a peculiararities for the average lay person and I don't like to see the unwary being taken advantage of.In fact I think that's why I became an expert witness, consultant and troubleshooter over 25 years ago.

For me, it was mowing lawns, painting rooms, repairing furniture, home computer repair / clean up / troubleshooting / lessons (especially with the elderly), etc.