Here's one for Lawrence, many moons ago in a Thread Far, Far Away you Posted: -
"The best servicing tool you have is knowledge, that's the skill, you've either got it or you ain't, if you ain't then go get some, that's my tip of the day."
As you hopefully appreciate I have been gathering knowledge as my skills have slowly improved over the years but sometimes people like myself just get stuck!
I thought I had been careful to try to follow the rule to replace and test components one at a time but may have got a bit lax towards the end as I had both FM and AM working very well.
"Just a few over tolerance resistors to replace and that's us" or so I thought - oops!
I will of course dig out my Velleman K7000 Signal Injector/Tracer and attempt to pin point where the problem lies, but as usual any advice or guidance would be welcomed.