Check the TPS and its IDL switch and check the ISCV while you're diagnosing things. IDL signal is used in the calculation of that error so it's worth inspecting even though those two components aren't on the TSRM's list.
TPS inspection and calibration:
http://www.cygnusx1.net/Supra/Librar...ction=FI&P=100
ISCV inspection:
http://www.cygnusx1.net/Supra/Librar...ction=FI&P=106
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