Jen,
most models are similar, but my best guess is...
http://gasrefrigeration.net/dom_tech...300_2800OP.PDF
page 6 shows an install diagram
on my 87 Dometic RM-2400, there are 4-6 screws around inside frame, and 2 at the rear lower corners.
lp gas line ( 2 wrenches needed !) unplug 120 from outlet, and maybe 2 12volt wires. then it was tight to the cabinet, just work it, There should be a silicone seal under unit( Below controls) to the wood to seal any lp gas / air / ants /uncles from coming in.
the other refer needs to seal to the interior, very important while using lp gas, no CO !
You said it works? is the gasket or hinge bad? what model do you have?