What was found
SQUAT SWITCH INTERNAL CONTACTS BTWN PIN 7 AND 9 DEVELOPED A HIGHER LEVEL OF RESISTANCE THAN THE OTHER INTERNAL PINS, CAUSING THE PRESSURIZATION SYSTEM TO SENSE A WEIGHT ON WHEELS SCENARIO, DEPRESSURIZING THE CABIN IN LEVEL FLIGHT. THE PILOT DROPPED FROM FLT LVL 250 DOWN TO 10,000 FT. ATC DECLARED AN EMERGENCY.