It should just be four screws, I think, but I've never had one out before. Hopefully someone else can chime in with more detail.
From what I've heard about these converters though, once it starts acting up, it's probably going bad and will have to be replaced. Hopefully it's just something loose, but I kinda doubt it.
I'd look into something like a Progressive Dynamics unit for a replacement, though you could put just about any converter in there that an RV dealer would have since you are on short notice, but the PD unit is much better quality.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR