As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF, NOTICED THAT WHEN APU SWITCH WAS MOVED TO OFF POSITION THE APU DID NOT SHUTDOWN. BLUE APU GEN OFF BUSS LIGHT REMAINED ILLUMINATED WITH APU GENERATOR POSITION SELECTED ON AC METER CPS FREQ 400 AND AC VOLT 116 WERE INDICATED. APU EGT UNLOADED WAS 280 DEGREES. ACFT GROUNDED. FOUND APU MASTER SWITCH BAD R & R OPS NORMAL WDM 49-62-11, OPS CK TEST IAW MM 49-11-00.