I need to figure out what type of Polaris I have and there are no model numbers on the unit itself only a serial number on the back. I'm trying to decide whether I want to rebuild this one or get a new pool cleaner. I'm coming up on three years with this house and the polaris came with it, but never did seem to work right for me. I've already paid to have it repaired once. I'd like to either rebuild it myself or just get something else like 'The Pool Cleaner" Pressure Side cleaner.