What was found
(CAN) LEFT MLG DID NOT SHOW DOWN AND LOCKED AFTER TWO CYCLES AND MANUAL EXTENSION ATTEMPTS. BOTH FORWARD PANEL AND SECONDARY INDICATORS ON S/O PANEL. DOWNLOCK SWITCHES MECHANICAL LINKAGE FOUND ADRIFT DUE TO MISSING NUT AT DOWNLOCK SWITCH. ALSO NOTED BOLT AT SWITCH END OF LINKAGE APPEARED BACKED OFF, ONLY ONE THREAD SHOWING THROUGH NUT. REPAIRED. PART TC: 187.