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Wish it were a clearer pic. The new blue cap is a 22 uF @ 500v Xicon. Put the crimped end aligned with the other crimped ends of the caps on the board. Wrap leads at C28. Put a dot of solder on each one. Good idea to add a dot of silicone to secure the body of the new cap to the board mounted caps. You are done.
This workd especially well alongside a TO20 mod. The two together will have your PRRI driving 4x10 cabs without breaking a sweat.