Ok on a Progressive 9200 there should be 2 or 3 fuses. they are on the outside of the converter housing near the connections for the 12 volt wires... UNPLUG from shore power before removal, replacement and testing fuses.. IF you can access them without removing the unit (I could not on my 9180 due to the way it was installed. no problem to remove it just a few screws_ you can test using a test light one side bright other dark = fuse blown. (NOTE disconnect batteries to test) but removal and both visual and ohmeter inspection is best.
My 9180 failed at 12.5 years the 9100 is basically the same as the 9100 but with the wizard built in (mine it was plugged in) Thankfully It failed the day before I headed south for the winter so Marshall, MI was only a few miles out of my way and both the removal and re-install took like 10 minutes each on my rig.
For the over nights I used a Deltran Battery Tender (Extra large) 2-20-70 amp
2 amp tender 20 amp; smart charger 70 amp; jump start_
If it's less than 10 PD may be willing to rebulid.. large lot beside the factory use the side Corner of Industrial and old US-27 Marshall, MI.