The computer will not take out the distributor. The ECM supplies 5 volts to the leds for the high and low resolution signals only. I suspect your problem was elsewhere and now they are trying to justify there initial diagnosis. Sounds like alot of guess work on thier part.
Conner

Over the hill but still climbing.
88 Montero 2.6L auto, manual hubs, cooling fan conversion gps,recurved distributor,LSD Diff.