I know that you can run a freezer slightly over the RLA. How do you figure the FLA if you know the RLA.

Here's the situation. A tech went on a PM. The freezer was working fine for years. He checked a R/I freezer. The amperage was 2 amps over the nameplate RLA. So he adjusted the CPR valve to get the RLA down to the nameplate rating.

Now the freezer won't maintain temperature. The trick is now--how do we get it back to where it was? It should I assume be between the RLA and the FLA. We just have to figure out the FLA.