3628 MCH Jammed - SOM SB: TC feedback MC ~~~~~ 3628 MCH Jammed - SOM SB: TC feedback MCH jammed at B3 position. Adjusted MS and MCH a few times but to no avail. TC was authorized to proceed in AM after AM Disallow lifted and TSR 40kph imposed at DBG SB. IMCC(RS) was informed. ID: 1.5min. (L3)  3628 found MCH able to cycle from EM to P4 when MS in RM & ATPM modes. Found pieces of dirt & debris in the MCH & the baseplate. Suspect FOD could have obstructed MCH movement & fault cleared due to dirt & debris shifting. MCH gear teeth bearing holders alignment - OK. No sign ofs of bolt loosening.Cleaned off all dirt & debris . Function checked MCH operation,smooth with no abnormalities. Koh WC(Jonanthan) 45272