As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 312 - BOS - LAS - EMERGENCY EQUIPMENT - CABIN INTERCOMMUNICATION DATA SYSTEM (CIDS) FAULT LIGHT IN CRUISE. CIDS TEST MESSAGE SLIDE LOW PRESSURE. REMOVED AND REPLACED LEFT OFF WING ESCAPE SLIDE INFLATION RESERVOIR PER MAINTENANCE MANUAL 25-62-46-401. NO MESSAGE ON CIDS PANEL.