They charge more after hours and weekends visits, service call fee about $100 just for showing up, plus diagnostics fee.

The relatively small amount of money spent for another diagnostic will be money well spent. 

The cost of the repair was around $490 (diagnostics).

. $175 for diagnostic and actually opening the damper...

I'm currenly a 91b was a mechanic on the civilian side for 4 years , this past year i moved away from that and currenly work for snapon tools as a diagnostic sales developer, as of right now I'm focusing on getting my education in REI  looking at my own financing and continue in my snapon career until I'm feel confident enough to fully pull the trigger with investing 

If the project gets off track you would complete three other types of analysis; a descriptive analysis (what happened), a diagnostic analysis (why it happened) followed by a prescriptive analysis (how do we fix it).

The AI takes your tenant through an emergency diagnostic.

They charge a diagnostics fee and if you give them the job, it goes towards the cost of the project.

We do however fix basic things on microwaves like turn table motors, handles, etc and those things we can typically price out and quote over the phone saving people a call out and diagnostics fee.

I'm waiting a diagnostic review but based on my experience of the flooding issue, the flood prevention system was either installed properly and did not work, was damaged during the back up or couldn't hold the pressure.