Scaling out of whack

I have a complex application that was written before I was hired. It's my baby now.
In the last day or so several voltage inputs are higher than they should be. I'm not sure whether it is just the two channels that are in the test being run, whether the voltages from the whole module are high, or everything is too high. For example, one channel is supposed to be 15 volts, but TestStand is reading 17 volts.
I don't think I messed anything up, but I could have. I haven't touched the tested for three days and I believe they use it every day. AFAIK it just started acting up today.
Is there anywhere special I should look? I am a rank beginner at LabView so no suggestion is too simple.
The people who use the line said that this ahd happened before, and my predecessor would adjust gains and offsets to "fix" the problem. Do analog FieldPoint need to be recalibrated every few months?

I'd say that a shift of 2 Volts was a  bit more than a minor calibration shift.  Suggest you get a second opinion using a calibrated o'scope or DMM and compare its reading to your FP before you start messing around with scales and offsets.

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