As other folks have mentioned, googling for the model number and problem will often turn up a solution.Exactly, I goggled the internet to troubleshoot our perfectly good 5 yr old dryer & found the gas valve solenoids are a common point of failure.

@Adam ShelleyYou should attempt to troubleshoot any issues over the phone with your tenant before sending over any contractors.

I ask where they've seen the bed bugs so I can come and inspect and they claim that such a question is proof that I knew of the bed bugs...After going around the world with this guy to explain that this is a normal troubleshooting step, identify where they've seen them so I can come and look, he claims he only responded with logic and that I'm wrong....Then he sends me another email telling me I'm being volatile and defensive...Then this beacon of logic asks me at 10:00 PM what time in the morning the exterminator will be by.

. :)Inspect & Troubleshoot Mobile Homes, Double wides, Caravans, Manufactured Homes, & Trailers (inspectapedia.com)Unfortunately even newer manufactured homes tend to depreciate like vehicles instead of appreciating like stick-built homes.

But even there I know how to troubleshoot so I'm not paying a guy to come out and replace an exhaust fan or thermostat.1.

Only thing I've had to be cautious of is spending too much time troubleshooting website development type issues.

They are really pretty easy to learn/ use and if you know how to troubleshoot your own issues it means you're not paying someone to do it for you. 

They came out and did the typical trouble shooting. 

To me it is troubleshooting home problems and working on houses.

Then troubleshoot one line at a time.