Jens
Great progress all around. As I remember your failure was sudden, maybe no smoke or odor. Losing both transmit and receive, I am thinking it might not relate to PA failure. I have jumped to wrong conclusions myself before.
Given local oscillators seem to be okay,? perhaps try a jumper wire from the antenna connector to the first mixer, bypassing a lot of stuff. Taking same to the lower frequency xtal filter should receive radio noise and any kind of signals at that frequency.? let's not rule out all that heat opening up a previously good connection on or off the board. By bypassing all those relays with a jumper takes them out of the matter. I hope you find its something simple or at least isolate it.
Others were on a similar wavelength.
Curt
