As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ILLUMINATED WHEN APU START WAS ATTEMPED ON THE GROUN IN SEATTLE. GROUNDED - YES. (RESOLVED ON W/O: 1968231 TASKCARD: N/R-00001 ) PERFORMED IFIM TASK 49-49-00-810-805 AND DETERMINED APU SGU TO BE FAULTY. REPLACED SGU REF AMM 49-41-21. OPS CHK GOOD. LEAK CHK GOOD. MEL 49-99A APPLIED REF L/P 60645195. PART NUMBER VERIFIED BY SEAMC JEREMYTHIS CLEARS MEL 49-11-01SEAMC PETER NOTIFIED.