As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, RIGHT PACK BITE MAINTENANCE MESSAGE FOUND ON ECS/MSG PAGE DURING OVERNIGHT CHECK. PERFORMED TROUBLESHOOTING PROCEDURES PER FIM 21-51-00/103 BITE TEST FAULTED ALTITUDE SWITCH. PREVIOUS TEST FAULTED ALTITUDE SWITCH. VERIFY TEST HAD NO FAULTS, TO GREEN LIGHT. RESET HAD GO GREEN LIGHT PER FIM 21-51-00/101 FIGURE 103, OK FOR SERVICE. MESSAGE ERASED.