What was found
AIRCRAFT WAS NOT GROUNDED: APU DISCHARGE LIGHT ILLUMINATED IN FLIGHT WITH NO OTHER INDICATION AND STAYED ILLUMINATED - MAINTENANCE ACCOMPLISHED APU FIRE LOOP AND SQUIB OPERATIONAL TEST WITH NO ISSUES NOTED - MAINTENANCE REPORTED A BITES CHECK OF THE APU FIRE DETECTION UNIT WAS GOOD - MAINTENANCE ACCOMPLISHED A TEST OF THE APU DISCHARGE PUSH BUTTON SWITCH WITH NO ISSUED NOTED - MAINTENANCE INSPECTED THE APU COMPARTMENT AND FOUND NO INDICATIONS OF BOTTLE DISCHARGE OR FIRE - MAINTENANCE REPORTED THAT THE APU DISCHARGE DISK WAS NORMAL WITH NO ISSUES NOTED