What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: ZONE E TEMPERATURE INCREASED AIR CONDITION RESET FAILED ADDITIONALLY MULTIPLE SMOKE ALARMS SOUNDED AND SMELLED SMOKED IN FIRST CLASS CABINS; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT BOS. REMOVED AND REPLACED ZONE-E TRIM AIR VALVE. OPERTIONAL AND LEAK CHECK GOOD, BUT ODOR CONTINUES WITH ZONE-B TRIM AIR SELECTED. PER AMM 21-61-02.