check transmission warning light: 2010 Acura TSX

Hi,

I have a 2010 Acura TSX and the "check transmissions" warning light came on 3 days ago. I checked the transmissions fluid. It was bad and I replaced it (flushed it). the warning still comes on. The car also seems to shift a bit sluggish. Any ideas? I am afraid to take it to a dealer.

BTW, I took it to Pep Boys and had them flush the transmission fluid. They used 12 quarts total - 6 to flush and 6 to refill. They used the generic compatible one - none of the expensive brands were in stock.

Thanks so much!