Indigo 7500: LUT/linescreen problems

curiosity

Well-known member
Recently discovered this anomaly. See 2 attached images.
Cyan is normal. Magenta is whack.
Only occurs at 210 l/s.
However, all linescreens show another oddity.
When outputting steps w/ a linear LUT, they measure as much as 10 points below linear.
HP has been called, and is working on it, but no solution yet.
Any input would be greatly appreciated.
 

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