[fried]

I am close to being able to start the engine on the 149 that i'm saving. Condition of the rear end and hydro are currently unknown. I'm looking for any advice or pointers on how to proceed.

Things i've done so far:
1) Forced release valves to the release position where they remained stuck and slowly pushed it about 50 yards into my garage. It may have been pushed/drug off the trailer a few weeks ago with the valves in the wrong position.
2) Popped rear plug out to check fluid level. It's definitely not up to the plug level but I can feel fluid when I stick my pinky down in the hole.
3) Took out release valves and worked them on the bench with wd-40/hammer/pliers to free them up. Put back on hydro and sprayed with more wd-40.
4) Observed that some of the bolts are missing behind the tires on both sides.

Based on y'all's expert advice should I top the hytran off and try it, replace fluid/filter and try it, or could there possibly be some damaged parts I will have to replace?
Are there any checks I can do right now to verify that the rear end is okay while I wait for my generator rebuild?