Finally did some research looking for information on the Magnetek 6409 power converter installed in the camper. Magnetek has been bought out by Parallax, their site had some minimal information on this unit, but a schematic was included. Not much info, but it's a simple design, so my planned fixes shouldn't present any problems.
Parallax's Technical Documents page is priceless, the picture of the 6400 series unit in the lower left highlights well my fuse issue, their product image actually shows masking tape holding the fuse in place. Too funny!
Plans at this point are to install a screw cap fuse holder, and two LEDs, one a 12v indicator, the other a 120v indicator. Too many times I've been left wondering during setup if I had the fuse in, if we had a good power pole, or if the lights had burnt out. A few status lights will answer those questions. My only concern is if I can find something to fill the hole left by the old fuse holder.