Hi! I have an Engel 45 that has performed flawlessly for about six months. It is on a second battery that is sending the proper charge to it. It has always been almost silent. About a month ago, when the compressor kicks in, it spins up extremely loud for a fridge, and every once in a while it has a screeching type noise. It is still performing just fine temp wise. I just don't want to damage the fridge. Any thoughts? I have called and emailed Engel several times with no response, so it looks like I am on my own. Thanks for any thoughts or suggestions you may have!