I know you asked about some info for this rig before :-https://charlietangodxgroup.forumotion.com/t4396-wanted-midland-77-095-user-manual-service-book
The only thing I could find off hand was the circuit diagram but not sure if this alone is helpful for you :-
If you're up to the task and have an appropriate trimmer tool the following video may help you :-
That's presuming that everything is OK with the rig in the first place but worth a punt nonetheless.
(Screams of 'golden screwdriver' ringing out right there!
As for appropriate trimmer tool you can't go much further wrong than shaving the pointy bit on a bic-biro pen cap to a small screwdriver shaped end and using that with the plastic being soft enough not to go cracking those ferrite cores(!)
So more of a plasticky-golden-screwdriver I suppose.
(A trick I've often used when stuck for an appropriate soft trimmer tool.
Just don't go using one of those 'jewellers' small metal screwdrivers...you'll only regret it.
I hope that helps you and remember anything you do to b*gger up your rig is your own fault not mine.
(Legal disclaimer I suppose.
I wish you well and best of luck.
All the best,