A Scope is nice if your understand what your looking at.
The easy way is the amp has an output line that goes to the
relays and filters. break that line and measure power there.
There is nothing that dies prior to Q90 that is in the Power amp.
However there are two IF amps that can be all sorts of wrong
and the alignment of the oscillators as well.
However CW is generated differently than SSB and for CW TX
none of the IF stages are used.
So the only things that can be broke is the 33mhz LPF alone
the edge or the power amp.