Right now on a working 2025 we are noticing that with mpt solenoid disconnected at J209 on the Driver PCA voltage will increase to around 24v when it tried to engage the solenoid. On our printers that are having the jam in tray 2 when tray 1 is loaded there will be no voltage increase just a steady 0.0vdc.
As of right now we have tried formatter with no luck. The tray 3 plastic was dislodged but that did not resolve the issue either. Neither did removing and cleaning the sensors in that area.
Update: Tried a new Driver PCA but this also had no results as the trace leading to the solenoid only passes thru 1 transistor after entering board from ribbon cable. Also added a tray 3 and ran pages from tray 3 without any issues so not likely an issue with the Paper feeder preregistration sensor (SR1)