Thanks for sharing your situation.? I looked at your info on QRZ and you have a nice station.? The IC-7000 isn't easy to troubleshoot!
Your latest J101 IF measurements looks like the unit isn't going into transmit mode.? Does the TX LED on the control panel come on when you key it in CW mode?
Since your unit receives okay, the IF circuits seem to be working.? Most of it is the same for RX & TX modes, except the pre-amps are bypassed in TX.
It's difficult to tell you where to look next.? If the TX LED is on when you keyed the unit to measure the signal levels, then the problem is probably on the MAIN board, which is harder to troubleshoot and repair.? Is there a ham in a local radio club perhaps that has experience working on Icom radios???
The 7000 is old enough that it probably isn't worth the cost of sending to a repair shop for this type of problem.? I know you have invested a lot of time and effort into it so far and? wish I could be of more help....
Steve W3AHL