As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL 330, R1 DOOR ALARM AND FLASHIG RED WARNING LIGHT. NO ECAM WARNINGS AND NO CABIN PRESSURE CHANGE, RED FLASHING WARNING LIGHT EXTINGUISHED DURING DESCENT BELOW FL 180. IAW AMM: 52-73-18-04 REMOVED AND REPLACED NR 2 AUTONOMOUS STANDBY POWER SUPPLY UNIT BATTERY IAW AMM. R1 DOOR SLIDE WARNING OPS CHECKS GOOD. OK FOR SERVICE.