I do not believe in two faults, the VCO assuming it is a VCO, might me fixed frequency and the if moves to change frequency.
Check 8 V on both VCO, tx rx, the check the o/p, tx and rx share a path, this is the likely area for a fault, however, the two UHF VCO also share a reference, and if this is missing or out of lock, an inhibit will come into play. Let me study further
73
Andrew
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Andrew Lenton