Hi 1jz,
Lp compressor stage reading drops down to 50% and less, then fluctuates at that value. All other parameters remaining quite normal.
Do you think that an LP compressor shaft shear can also produce same or similar readings
No.
If all other parameters are normal, then it must be an indication fault.
At high speed (above 100kts) we never rejected take off for a single parameter - we had to have at least two indications (e.g. a swing + a gauge indication).
At low speed (below 100 kts) we could consider stopping for anything.
What is your low speed limit during take off?