Sorry for blowing up your thread but as for repairing it, might not hurt to draw up a schematic based on the board and try to ascertain exactly what the resistor is doing and why it is in the range it is in.

If it were me, I would separate out the pressure signaling system and see on which side the anomaly occurs. If you provide a solid signal and it still oscillates, the problem is probably in the main board. On the other hand, if a solid signal produces a one-off effect, the issue is in the pressure sensing module. Something is causing it to oscillate.