Hi Keith - and thanks,
Checked current price of those rather old fashioned TO3 FETs - thought how much I'd lose if the new ones went pop for no obvious reason then I chicken'd out - cluck.
Did the HH-Laney biz on line in initial hopes of the shematic (they said they hadn't got one, but could mend the amp for a price - heavier than the amp, I suspect)
Possibly send cust your way if you wish - he wants it done last week, or sooner - Chris.