What was found
BOS - INFLIGHT CARGO DETECTION AIR STATUS MESSAGE DISPLAYED AFTER TAKEOFF. RETURNED TO BOS AND LANDED WITHOUT INCIDENT. REPLACED PLENUM PRESSURE SWITCH FOR NUMBER 4 SMOKE DETECTION BLOWER. SYSTEM GROUND CHECKED NORMAL OPERATION.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BOS - INFLIGHT CARGO DETECTION AIR STATUS MESSAGE DISPLAYED AFTER TAKEOFF. RETURNED TO BOS AND LANDED WITHOUT INCIDENT. REPLACED PLENUM PRESSURE SWITCH FOR NUMBER 4 SMOKE DETECTION BLOWER. SYSTEM GROUND CHECKED NORMAL OPERATION.