Due to carelessness on my part my 4800 got keyed for a few mins without the coax attached. While working mo my setup I removed my coax not realizing my radio was on a squelched all the way out. When I placed my drill on the dash it got against my ptt button and you can guess the rest. I’ve replaced the finals driver voltage regulator and the audio transistor in front of the voltage reg still no out put. It does switch to tx but no movement on the meter or on my dosy. Talk back does work. What else can I check? I love this ole rig.