As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUE TO LOSS OF CABIN PRESSURE, AIRCRAFT DESCENDED TO A LOWER ALTITUDE CAUSING ADDITONAL FUEL BURN. FLIGHT DIVERT- TO BNA FOR ADDITIONAL FUEL. SUSPECTED GND SENSING SQUAT SW M990 FAILED. REPLACED M990 AS PRECAUTION AND ADJUSTED MLG SAFETY SENSOR.