Just as an FYI.... After disconnecting and removing the inverter from it's compartment I opened it up to examine the insides. The only easily replaceable item was the cooling fan. Everything else is hard soldered. After removing the fan I could see that it was not operating properly and did not spin freely. I squirted a few drops of light oil down into the fan and spun it till it freed up. I figure this will last a few weeks at best.
I contacted the company and was told they did not sell replacement parts but they would check their RMA items to see if they could send me a fan from a returned inverter. It's been a week and no fan and I'm worried that if it came out of an RMA item, was it returned for the same reason mine is not working. I'm not waiting on a fan that may, or may not work any better than the one I have. I will look around and purchase a larger inverter and just replace what I have. Lesson learned!