What was found
GEN BUS 1 FAILURE AT FL 280 (LAS) COMPLIED W/ RED TABS -ONLY RESTORED FOR 5-10 SEC AT BUS FAULT, ATTEMPTED CHECKLIST 2ND TIME AFTER APU STARTED/SAME, ATTEMPTED CHECKLIST 3RD TIME AFTER GEN 1 DISCONNECT/SAME, SHOT RAW DATA APP F/O SIDE. UNEVENTFUL LANDING WITH EMERGENCY POWER ON LAST 15 MIN.