What was found
FLT 941 - MTY-MEX - CABIN CREW REPORTED OTU OF SERVICE THE LANDING ALTITUDE SELECTOR, AS CONSEQUENCE OF SPARE PARTS MISSING IN MTY, MEX SENT SUCH PARTS IN FLT 944. AT ARRIVING, THE SELECTOR PANEL WAS SWAPPED, TEST OK, IAW MM 21-31-01. AT RON MEX 13/14 TESTS WERE PERFORMED OK. THE SPARE PARTS WRE INSTALLED TO THE AIRCRAFT, TESTS OK IAW MM 21-31-01. (M)