SLC5/04 to 5/05 RTD issues

Hi all,
following problem: We changed a CPU from SLC5/04 to SLC5/05. Nothing else has changed. 4 RTD's are hooked up. Reading on new SLC05 is out by app.10% (higher). Will it helt to modify the filter? Any other ideas?
Cheers

Nothing else has changed.

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I bet that you had to load a copy of your program into the SLC 5/05. Are you sure that is is the same program that was running in the old SLC 5/04? Sometimes backup copies are not the same, because field changes get made to the running PLC program - for example, changing the scale factors for temperature indicators to make them read the same as a field temperature gage.