Having reviewed and purchased the AC-3500p , I have had nothing but exceptional customer service from Bob Neill of worldwide wholesale distributors.
https://www.thesoundadvocate.com/2020/02/report-inakustik-ac-3500p-power-station-and-ls-4004-air-spe...Bob’s enthusiasm is only exceeded by his personal touch as to taking care of any need one might have. He promptly had my LS-4004 cables re- terminated in a quick and timely fashion.
I don’t understand fully your problem but since he offered all the above services, I can’t see what’s gnawing at you?
Reverse Polarity....mmmm - interesting. This power station is arguably, the finest addition I have added to my moderately changing Review system I’ve ever had the pleasure of using. I contend that NOTHING- at any price will out maneuver it!! As noted above, why open a unit that is so magnificent right out of the box!!
If you were a bit more intuitive, you should have ( and still can) talk to Bob and let your “ problem” all hang out. He can and will satisfy any needs you may have!
Howard