Plan is to check it over , check the board , soldering, connectors etc
When mine arrived, I opened the casing and checked for loose hardware and correct seating of plugs and push-on tags.
The main internal negative power cable was barely finger-tight where it was bolted to the heavy track on the inverter PCB, and all four of the push-on tags at the bridge rectifier, and those at the back of the main power switch, were rather loose. I ended up soldering all of them on.