Trace SW2612E Problem

Hi everybody,

I recently purchased a Trace SW2612E off of ebay as spares or repairs in hopes of fixing it. The guy I bought it off said it had powered his home for 15 years until one day the lights went out and there was a humming sound and heatsink overtemp displayed. Anyways I took it home connected a battery, it powers up fine however when I press invert the inverters transformers pulse with loud 50hz ish hum. It sounds like it's trying to inverter, pulling to much current the tripping and starting the process again. I opened it up there isn't any obvious problems, all the MOSFETs seem fine. I'm unsure on how to proceed.

Many thanks,

Matthew

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