What was found
EWR - FLT 353 - EN ROUTE LGA-ORD, TAIL COMPARTMENT TEMPERATURE HIGH LIGHT AND MASTER WARNING LIGHT ILLUMINATED ON CLIMB-OUT FROM LGA. ACCOMPLISHED RED BOX ITEMS, WAITED TWO MINUTES, LIGHT DID NOT GO OUT. DECLARED EMERGENCY AND LANDED AT EWR. LIGHT WENT OUT AS POWER WAS REDUCED DURING DESCENT. LANDED EWR WITHOUT INCIDENT. REPLACED BOTH TAIL COMPARTMENT TEMPERATURE OVERHEAT SWITCHES. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)