After standing train protection, TC reportedMCH was jammed. TC toggled the MS a few times to clearfault. TC feedback MCH felt a bit stuck but still able to m ove. ~~~~~ #3657 checked and found small stone (FOD) inside mode selector. Removed , cleaned and serviced the MS and MCH. Torque the bolts and function tested-MCH able to move smoothly. Done by: Sanip