Thanks for the additional information. Based on the comparisons at DE end, it seems this "flattened" orbit shape in horiz direction has been there even before the recent re-start. Hmmm...
I don't have extensive experience with disc type couplings; I suspect John has more than I and he may be suspecting some issues there. My understanding is that these type of couplings are fairly easy to inspect, even while running (with strobe). Others can weigh in on this and provide better direction. Regardless, it would be nice to know the actual as-is alignment condition based on the still unusual orbit display - even though it may not explain the changes in the NDE.
Is it safe to assume your comment "... with misalignment axial: +-2mm, axial: 0.77mm." is the allowed SPEC and not the actual as-is condition?
The only other thing I can suggest is to see if these readings and displays are sensitive to flow or temperature. Does this pump generally run at constant conditions?
Lastly, AZIZ58 seems to have had experience with these pumps running with strainer/filter issues, can you rule them out?
Keep us informed