[Terry_VK5TM]

It's beginning to sound like your first hunch about the PA transistors may be correct.

You can do a meter test on the transistors by lifting a few component connections, but you will probably have to remove the PA module to do it.

The connections to lift are:

Both ends of T1301 that connect to the bases of the transistors.

R1308 and R1309 (15 ohm resistors that connect between the bases and ground).

Both ends of T1302 that connect to the collectors.

That will isolate the transistors so that you can do the tests - B to C, B to E and C to E.

I would suggest getting a clear close up photo before you disconnect anything as a reference.

If the transistors are faulty, RF Parts in the US has them, probably not the cheapest, but guaranteed quality.