Check the manual, also swap the input 6922 tubes from left to right monoblock to see if that fixes it. Otherwise time to check fuses.
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Sorry, neither me nor either of my two friends have had this problem.
Cytocycle's advice is good, as it might determine if it is just a tube problem.
(If it is, great, a cheap solution!)
If not, ouch, as that means sending them back to Lamm. (Something I am not looking forward too, if, and/or when, my amps experience problems.)
Good Luck, and I hope it is a tube!!!!!