As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 738 FROM TOL TO SLW - DURING CLIMB-OUT, THE AFT AIRSTAIR LIGHT ILLUMINATED IN FLIGHT. THE AIRCRAFT RETURNED TO TOL WHERE IT LANDED WITHOUT INCIDENT. POST FLIGHT INSPECTION REVEALED THAT THE AFT AIRSTAIR CONTROL HANDLE MICROSWITCH WAS AT FAULT. THE AFT AIRSTAIR CONTROL HANDLE MICROSWITCH WAS REMOVED AND REPLACED, ADJUSTED AND PERFORMED, OPS CHECK ALL CHECKS GOOD. AIRCRAFT WAS RETURNED TO SERVICE.