Yes, it does seem unlikely. But then if those burn marks are only on PAL because a different negative/print was used for the NTSC telecine, then those video drop-out lookalike marks would have to be on the original negative, which would put them on every OT version (which they aren't), or on an interpositive/intergnegative that was used for the NTSC telecine and then burned before making the PAL telecine which seems more unlikely. Does anyone know the generational history of the THX transfers?