Interesting - I had oddball switch issues on my Firepower, and now column 6 switches do not work at all. I suspect I had the same problem. I put some electrical tape over the mounting hole.

Can anybody tell me which chip I need to replace on the rottendog combo? Where is it located?

I cannot find the schematics for the board. Thanks.

Yes I put some electrical tape over the mounting tab and ordered a few of those chips. Hopefully that's the issue.

It was doing all sorts of crazy switch matrix shit before settling on one row not working so likely so.