What was found
AT FLT LEVEL 310, MCD ANNUNCIATOR LIGHT ILLUMINATED. ACCOMPLISHED CHECKLIST AND DEPRESSURIZED A/C IN DESCENT. LIGHT REMAINED ILLUMINATED UNTIL 2,000 FEET ABOVE GROUND LEVEL ON APPROACH, THEN WENT OUT. NO OTHER SYMPTOMS WERE NOTED, NO NOISE OR LOSS OF PRESSURIZATION. A/C RELEASED FOR SERVICE PER MEL 52-4 CATEGORY A EXP 6-1-96. *S/D* FOUND SCREW GROUNDING OUT LOCK ROD WARNING SWITCH, FOUND SAME SWITCH BROKEN. REPLACED SCREW AND SWITCH, OPS CK GOOD PER MM 52-70-09.