My 7002 only recently had its 5th birthday and lo & behold... it died.
In my case it was the standby rapid blink of death.
Tried various power cycles (i.e. full off at the wall for 30 min) and each time I try and reset it it springs to life for about 2 sec only to die the same way.
So I got hold of some info & schematics and one of the things it suggests very early in the fault tree is to check the various DC rails.
No great surprise there.
All the fuses looked good - and as has already been noted, this is one check-full-o-cards mother of a brick!
Quality of construction seems ok (quite decent for consumer gear), with all the heavier bits supported one way or the other, and all cables tied off. Does make it a mungrel to get into however...
Once I'd worked out where things were I poked around and began to realise the +15VDC rail was not a happy chap.
Keep in mind it's necessary to do a 3 button reset to actually force the secondary DC stages to spring into life, and they then shut down 2 sec later, so testing of a fairly basic DC rail fault is actually a bit difficult.
I confirmed the 3 terminal +15V regulator is shot, so I'm currently looking for the part, as it's current output is spec'd a bit higher than your average device.
Pulling out the power stages is not as bad as it first seems as they are all installed on a common rail/heat-sink, which lifts out after I think 4 screws. The trick is carefully unplgging all the cables which go over & into it first - without losing track of what goes where.
I'll let you know if this proves to be it.