Thanks to jdandy for his informative post. I recently picked up a used F110 sub with an early 2012 build date, and decided to take a peak at the capacitors on the amp board.
My unit uses Capxon capacitors, but there appears to be several different series identified by color. About half of the caps with blue labels had high ESR. The 33uf / 400v cap was was in very bad condition. All of the black, orange, and green labeled caps measured fine.
I changed all the blue labeled caps for new 105 degree Nichicons which were listed as well suited for switching power supplies (which is basically what these amps are).
Here's a photo in case it proves useful for anyone with an F110 who wants to do this themselves:
