I was avionics, never messed with them. Maintenance on them was done at the depot. IF you are trying to repair the tube type, you will need a tube tester like a TV-7A. Without it, you would turn out marginal units. I was at Norton AFB when Comm and Nav shops combined. The HF radios were repaired by a couple older civilians. When our guys started working on them, they asked where the tube tester was and were told, "We don't use them." Needless to say, the reliability went up on the HF radios. I guess they didn't want to work themselves out of a job.
To repair either one, you'd need a lot of test equipment. Attached is a minimum listing. Do you have all of this? Private message me if you have more questions, or e-mail me at bit73burger@yahoo. com.