As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1734, SFO-BOS. (ETOPS) 'PERFORMED APU CSS IAW A49-00-01A APU START SUCCESSFUL AFTER #1 ATTEMPT. APU AUTO SHUTDOWN AFTER RUNNING 8'23'; REMOVED AND REPLACED APU DIFFERENTIAL PRESSURE SENSOR 8071KM PER AMM 49-91-14. REMOVED AND REPLACED BOTH OIL FILTER ELEMENTS PER AMM 49-91-41 OPS TEST SATISFACTORY NO OIL LEAKS. REF ITEM 1 OF PAGE 4220035 (REMOVED AND REPLACED APU DIFFERENTIAL PRESSURE SENSOR 8070KM PER AMM 49-91-14. OPS TEST SATISFACTORY. NO LEAKS NOTED.) FOR SWITCH 8070KM.'