The CFM56-5 has reverser doors, 4 on each engine
The V2500 has a reverser cowl, one per engine.
The reversers can be unlocked, but until the doors move they are not unstowed.
The REV amber only shows when that engine's reverser is unlocked.
When the reverser is locked out by maintenance, the doors/cowl is physically bolted closed. In this case you can ignore amber REV indications.