Thank you Pentagrid for your quick reply. I think you might be onto something. The set functions very rarely I've only gotten it 3-4 times out of dozens of tries. I'll talk more in depth now about issues as I didn't want my first post to be too wordy.
I did notice that sometimes when the set was functioning it would almost sound like it was entering regeneration like a Regen set. It would be very slight, but it would start to oscillate very slightly and was very easy to tune out and back on frequency and have it disappear. This only happened once or twice in 6-7 hours of listening. The receiver remained extremely stable throughout the sessions I had it going.
The owner whilst butchering the RF board was not shy with the plumbing solder and made a mess, solder did drip on a couple components. What was easy to clean off (solder blobs stuck to the board for example) I removed. I got all the solder off except on 2 parts. It got onto 1 capacitor, but seems to be electrically isolated. I will probably replace this capacitor, as I feel like this will affect the function and possibly allow signals to enter/leave. The part I am majorly concerned about is L101. The previous owner allowed a solder blob to make it onto one of the windings on the coil. The coil still has good continuity, but the solder also has continuity to the rest of the coil. This coil either needs rewinding or replaced, as sections of that coil are probably bypassed by the solder. I anticipated needing to replace that coil before the set was working at all, but was surprised when it started to work and work well on what seemed like all bands.
Does anyone on here have a source for L101 for the RF board, or any advice on whether this solder blob on L101 would affect the radio in the way I am describing? I am not familiar with the way these sets function. I will most likely try to wind a new L101 or try to find a replacement even if this not the root of my problem, but I would like to avoid buying a whole other FRG7 to save this one, as this one isn't in the best shape as you can imagine.