Roadtrip
Personally my first point of call would have been the EVC 'golden filter' especially if there had no previous engine problems, then if there had been another 'event' time to look deeper (trim run?). IIRC the -7 could on rare occassions suffer engine steady state stall at high altitude I think caused by inlet spillage
and IIRC the -7R4G2 got round that with the auto recovery system that opened 2 of the 3.5 BV's.
The EVC system is different in as much as the -7Q has a combined Engine Vane Bleed Control Unit that has an added refinement of mach probes (3 off) at the outlet of the LP compresor.
measuring mass and velocity of the air entering the N2 comp. The EVC system of the -7J was basically the same as the -7A and -7F.
that's excersized the brain cells a bit