Hi Roger
Where about are you?? If its doing everything except transmitting then you're probably right that the output transistors have failed because of transmitting without a load on it.? I'd be happy to have a look if you can't find anyone closer or better qualified.? It is probably a matter of replacing Q1, Q2 and Q3 and confirming that the other transistors are OK.? I'm in south east Scotland.
All the best
Peter, GM0EUL
Peter GM0EUL