What was found
ORD - FLT 575 - DURING CLIMB-OUT AT FL 20,000 FT, GEAR DOOR WARNING LIGHT ILLUMINATED. CREW TURNED ENGINE DRIVEN HYDRAULIC PUMPS TO HIGH AND LIGHT EXTINGUISHED. FLT CONTINUED TO ORD AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND RIGHT MAIN GEAR DOOR SENSOR OUT OF ADJUSTMENT. ADJUSTED RIGHT MAIN GEAR DOOR SENSOR. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)