I have a high VHF MT500 that has basically no transmit deviation. I don’t have a service monitor for it so I’ve been testing by just transmitting and talking into it with a nearby receiver. There is basically no deviation unless I turn it up all the way on R211/R212 (the only thing to do with transmit deviation I could find in the service manual) and even then it is barely audible. The carrier it puts out is nice and clean, and it also receives fine. I have swapped out the microphone in the radio to no avail. Are there other adjustments? I don’t know if the PL deviates/transmits properly, this is a DPL model it seems like and I don’t know the code. I suspect that there’s a dead microphone preamp somewhere, any tips on how to replace that and where it is? I may seem dumb, this is my first time with a crystal controlled former part 90 HT. Thanks.