I would consider myself an above average DIYer
. I have been a mechanic or technician on various things all my life. I say all that to say I called a repairman for $90 diagnostic fee. I hope he doesn't suck. The sealed system is under warranty (which needs an authorized repairman). Secondly I know enough about refrigerant systems to know I need specific tools (which I don't have) for such a small system to diagnose a clog, low Freon level, or bad compressor. My fingers are crossed. I will report back my experience and what the fix was.