Here is the information from Dillon reference RL 550 service.
"It sounds like your loader is in need of lubrication is all.
We charge $67.95 for clean and lube service, which includes return shipping in the 48 contiguous US.
We strip it down, clean it in the solvent tank, inspect it; replacing all worn or damaged parts
(missing parts are not covered) and then re-lube and reassemble it. Typical In-house turnaround time is about 2 weeks."
If this information will help you my press was not operating well and had been dropped/knocked over by one of our curious cats during a reorganizing move to a different bench. Got to love cats who think they need to rub up against and check out everything you are working with.
They gave me a RMA number to return the press when they heard it had been dropped and possibly froze up. They received it the 10th so I will be looking to get it back in a couple of weeks.