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Looks like Q520 and 521 are your RF amplifiers. Make sure they have proper supply voltage. A failure in the RF section might severely hinder the sensitivity but you'd still be able to tune a station or pump one in via signal generator. Q522 is the oscillator. If its got 12 volts on the emitter, scope it out for 10.7 mhz. An FM signal generator is extremely helpful here.
If the front end is working, then check for 10.7mhz at the entrance to the IF strip, and see where it disappears. However, based on my experience with these sets the oscillator transistor seems to have the highest failure rate.
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Jordan
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