Here is what I would do - replace both Caps, rebuild the HV section, create a stronger ground for both caps, tie TP1 with TP3, replace j3 header pins and make a nice new plastic HV section cover.  Can't see the back but I would check for burning on the flipper relay tracks and put in additional jumpers if they look toasty, as well as tidying up any previous hacks.  Lets see how close I am!

cheers
Ian