TC reported MCH jammed at cab 3635 and it was difficult to move from B3 to P1. ~~~~~ 3635 TC reported MCH jammed at cab and it was difficult to move from B3 to P1.  3635 checked all securing bolts for MS/MCH cam s/w assembly - OK. Function test & found when MS in ATPM, MCH operation slightly stiff. If MS in FOR/REV, MCH operation - OK.  Ridzuan 43897 TO FOLLOW UP RECTIFICATION.  3635 found bearing securing bolts slightly over-torque for MCH. Re-torque to 6NM, applied torque seal & a thin a layer of grease - Done. Re-checked MCH operation, no stiffness movement (console desk cover removed).    Re-checked MCH operation (with console desk cover installed), no stiffness in movement. Checks done with Mode Selector in FOR/REV/ATPM - OK.  Au TK 43898