As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - FL 7010 - ON CLIMB-OUT, FLIGHT ATTENDANT NOTIFIED CAPTAIN OF BURNING SMELL IN CABIN. PUT PRESSURIZATION SYSTEM INTO STANDBY AND RETURNED TO SJU. FLIGHT LANDED WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED THE NR ONE TRANSFORMER RECTIFIER. (M)