TC reported MCH was jammed and MC key was stuck. TC subsequently changed end and returned to BSD. ~~~~~ TC reported MCH was jammed and MC key wa     #3527 Conduct functional check MCH no abnormalities.Unable to duplicate check and found MS gear mechanism slightly off position.Adjusted MS gear mechanism and re-torque done.Functional check MS & MCH ok.No sign of jammed,key able to remove. Done by Saini/Zulq.  26/03/23