Haven't been on this forum in a while but always great infomation. I'm pretty sure I have the same problem. I replaced the shaft "O ring" and still have the leak and it appeared to start coming up around the shaft in the area of the "filter" portion of the multiport valve. I've got to take back the cover "O ring" that I was sold as it is much to big. I had seen what appeared to be just the covers hanging ont he pool store wall display. So, I think I'll price them and then see if my JB Weld putty is still good before disassembling the valve again. It is scorching hot out today again. I've got a feeling I've got the crack. I looked during the change out but couldn't see anything. I'll have to put it under a magnifying glass and use a powerful light. Have a great day all and I'll report back.

John