The maintenance staff are not trained to "set up" the aircraft for flight and so CAN NOT be responsable for the switch positions of an aircraft that is offerd for service.
The sujestion that the maintenance staff are responsable for this accccident is not sustanable, after all the logical conclusion of this would be demanding the maintenance guy to set the FMC and all the navigation radios.
The bottom line is that the fault for the flight deck not being set up properly lies with the crew, just as not knowing what the warning horn was telling them and not stopping the climb when they got the warning.
( I offer this opinion as a 73NG rated person)