Having also done a ton of amp repair in the past, I will say, and I mean it in the nicest way possible, that HFi1000D amp is not worth what the parts / labor / shipping will cost to fix it. Best bet with amps like that, list for sale locally as Parts / Needs Repair / Blown (or
ebay) and hope someone wants a project to tinker with, recoup $20-$30 if you can, and buy a new cheap amp. Which won't cost all that much more than having that one repaired, and at least you have warranty with the new cheap one.
Nearly any time I quoted the repair on similar amps, no one wanted to spend the money to fix them, and I was even dirt cheap compared to the online amp repair places. I would suggest looking at craigslist / marketplace for people local to you that work on amps and see if you can find someone cheap near you to do it and you can drop it off in person. I remember plenty of the "forum amp repair guys" vanishing with peoples amps 10-15 years ago, so always a risk of not getting your amp back when mailing it to random people for repair.