Failure isolated to separate PCB assembly for CCFL switching power.
The CCFL switching supply assembly is marked Ambit Rev:2 T501045.00.
Blown fuses on CCFL supply assembly. Cause seems to have come from two caps on the PCB - marked: Teapo 220uF 25V.
2 caps per unit affected, total of 4 for two LCD units. Bulging on 2 caps, minor electrolyte leakage on one.
poo
I'll follow up with final repair...