What was found
FLT#909, BOS-NAS. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS). 'CB Q16 TRIPPED IN FLT C/B TRIPPED R ELEC BAY ECAM; SEE ITEM-2 9SLAVED IN ELAC-2 PER AMM 27-93-34, NO HELP. FOLLOWED TSM 27-93-00-810-836-A & R/R PITCH TRIM ACTUATOR ELECTRONIC MODULE-1 PER AMM 27-44-57. OPS CK'D SATIS. ALSO PERF'D ELAC OPS TEST PER 27-93-00 & ELAC + SEC LOGICS PER AMM 27-96-00. ALL TESTS SATIS & THE FAULT MSG DID NOT SHOW. C/B FOR ELAC-2 STAYED CLOSED. ITEM OK FOR SVC AT THIS TIME. ). PTCH TRIM ACTUATOR ELECTRONIC MODULE WAS REMOVED AND REPLACED. DURING THS ACTUATOR ELECTRICAL CTRL TEST PER AMM 27-41-00, ELAC OPS TEST PER AMM 27-93-00 & ELAC AND SEC LOGIC TEST PER AMM 27-96-00. THE C/B STAYED CLOSED & COULD NOT DUPLICATE THE SYMPTOM. ITEM OK FOR SVC AT THIS TIME.'