TDS540 with minor capacitor plague has a heavy fail: broken CTL , a IC with cooler tower is semi-broken. Differntial-ECL output, one of both is open, dead. But TDS540 is with this bad U1001(CTL) useable (but SPC always failed, because jitter-generator didn't work.)
Good news: i have spare part of TDS520 (it is build up with TDS540A acqusisition board,)
U1001 (CTL) Swapped -> this error "ctlconfidenceDiag blabla = 7" disappears. Next error is bad memory in CH2.
Etched thourgh pcb trace: only 3, but i guess: Bad memorys cause is also etched pcb trace.