Robert:
Did they use your 65mm IP from 1991 for the scan, or did they go back to the faded Technirama negatives and separation masters and recombine them at 4K resolution?
Vincent
The negatives were faded in 1991. I imagine they'd have to combine the negatives with at least one of the black-and-white separation records to reclaim the color if this is truly the case.
Vincent