You can reset each individual model while in that selected model by opening and selecting the #2 menu, then select MDL-RES (model reset), then hold both the (+) and (–) buttons down at the same time. I would change to the other models stored and reset all of those models listed, too, while you're at it.
The complete 3PK instruction manual can also be found in PDF format
here.
It's a fantastic radio once you get to know where everything is.
doug