As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5189 - PILOTS REPORTED THAT AFTER TAKEOFF THE STALL HEAT ANNUNCIATOR ILLUMINATED AND THEY WERE UNABLE TO PRESSURIZE THE AIRCRAFT. MAINTENANCE INSPECTED AND CLEANED THE LEFT HAND SQUAT SWITCH IAW MM 32-60-05. NO DEFECTS WERE NOTED AND THE OPERATIONAL CHECKS WERE GOOD.