I dropped ours few years ago. Though not too difficult some time and effort needed. Fuel line -few wires to fuel solenoid, battery cables, 3 plug in harnesses, 1 hard wired flexible conduit that once front panel loosened, wires can be disconnected and flexible conduit moved to side. I had to pull tail pipe for clearance. Hardest part was balancing as I used a floor jack to drop and roll out. Second set of hand would make easy. I doubt it would make it 5 years ago easier so if needed again Id probably farm out now.
Cant say I'd recommend doing. Hardest part of growing old for me is dealing with what I cant or shouldn't do any more. Course Margaret yelling at me is almost as painful as pushing myself.
You've got a couple of years on me but if you were closer I'd think we could get it down without hurting ourselves, well other than rolling around the concrete which just isn't fun anymore.
All that said, I dont know where the 'bypass' switch is or what it does but if behind the front panel possibly might access by pulling it out a bit? Not knowing symptoms cant suggest any work arounds. Ours its the wires to fuel solenoid that constantly corrode as they are exposed and need occasional fiddling to make contact but you said once started it runs. I also have a bypass switch but its on the start circuit.