Report "My x08 shower is leaking. I replaced the mixing cartridge O-ring, and that did not fix the leak. Today I replaced the 2 piece assemble with the one piece upgrade part 974-042, but it is still leaking, so I don't think that the O-rings are the problem. I tried to clear out any gunk from the back wall using a scotch-brite pad, but that did not help. Any other suggestions?"