Okay, made progress tonight and fixed my botched RAM swap. After doing a thorough pin-to-pin check I discovered that I had no continuity for the CAS pins (CAS.HI) on the G-row bank of RAM to pin-2 of the RP3 resistor array. So after fixing this, I am now back to my original issue of the "_2_0_F" error code being displayed - I have never been so happy to see this error.

Now that I'm back to square-one, I'll take a closer look at the analog board and also check the muxes on the logic board.