What was found
(CAN) THE ACFT WAS RELEASED FROM YUL UNDER MEL FOR LT MLG MECHANICAL DOWNLOCK INDICATOR. AFTER LG EXTENSION ON APPROACH, FLIGHT REPORT CREW REPORTED THEY DID NOT HAVE DOWNLOCK INDICATION ON BOTH LT LG POSITION INDICATORS AND DECLARED EMERGENCY LANDING. AFTER LANDING ACFT WAS LEFT ON RUNWAY DUE TO DIFFICULTIES TO INSTALL LT MLG GROUND SAFETY PIN AND PRELIMINARY INVESTIGATION SHOWED THE DOWNLOCK INDICATION LINKAGE AND LOCK LINK ASSY IS DAMAGED. INVESTIGATION ON GOING.