What was found
AIRTURN BACK DUE TO EICAS OUTFLOW VALVE RIGHT, CABIN ALT AUTO CMC HAD LOGGED OUTFLOW VALVE R (STATUS AND ADVISORY), CABIN ALT AUTO (STATUS MSGS). REFER BARCODE T3F18E006T5LY LEFT OUT FLOW VLV POSITIONED CLOSED, FOUND €ŒR ICU CABIN PRESS CONT€? CIRCUIT BREAKER PULLED & COLLARED INSTEAD OF €ŒL ICU CABIN PRESS CONT€? ON THE P6 PANEL . PER MEL 21-31-1-1-2 PULLED & COLLARED THE CORRECT C/B L ICU CABIN PRESS CONTROLL?. PERF CMC CPCS CH A & CH B GROUND TESTS PER AMM TASK 21-31-00-715-001, BOTH TESTS PASSED. PERF OP CK OF THE R OUTFLOW VLV & MANUAL MODE CTRL PER AMM TASK 21-31-00-705-065, VERFIED R OUTFLOW VLV OPENED/CLOSED. NO R OUTFLOW VLV & CABIN ALT AUTO MSGS ACTIVE IN CMC AT THIS TIME.