We feel your pain, tough deal considering how much you have worked on it. Have you done any work on the trim sender wires or bellows recently? Does the flow of water change if you try to trim in/out. The wires have the molded on seal that seems to seal well. Just a SWAG, but I'd guess with all the trauma that's been going on back there, I'd suspect the bellows may have been brittle and cracked. Much easier to change if you pull the pivot bolts. I've never used the special bellows tool before, but some say it makes the job easier. Use a liberal amount of 3M 5200 on all the surfaces, it really fills in the gaps well. I'll be around next Wednesday afternoon if you need a hand, can bring tools.