As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM AS A CONSEQUENCE OF FLIGHT INTERPHONE FROM CABIN TO FLIGHT DECK OF 3RD STATION INOPERATIVE. INTERPHONE WAS DISCONNECTED AND DEFERRED IAW MEL 23-8. DURING OVERNIGHT SERVICE, HANDSET NR 4 WAS REPLACED IAW MM 23-50-00, TESTED CORRECT. DEFERRED REPORT WAS CLOSED.