Did you ever get this to work?
I have an FTM-350 also and can't get the cross-band repeat to work.
1) I go to special function mode
2) I select menu selection 11 (cross-band repeat)
3) I press the left main button ( I get only 2 beeps; no Ok? [SET])
At this point, nothing happens by pressing Left band button. Just 2 beeps. Escaping is the only way to get out and there is no cross-band repeat.
Has anyone been successful at getting this to work? Was there some trick not covered in the skimpy manual?