That is an amp also, sometimes they fail, sometimes its the larger MB3733 in the back on the heatsink
If you are comfortable with desolder / solder, you can swap them left and right and see if problem travels.
Note it is impossible to remove the MB3733 from the heatsink while caps are installed, it is easier to desolder both and remove heatsink with them attached.
You can steal an MB3733 off SEGA16b and some other boards if needed for a test also. Not easiest to find
Not vouching for the seller but this is the SIP amp you are poking at
This is the larger amp on heatsink
MB3733 is a Fujitsu 20W BTL Audio power sound amplifier & is a low frequency, high power amplifier with internal BTL (balanced transformer less) circuitry
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