What was found
ON CLIMB OUT, RECEIVED R-2 DOOR WARNING (OPEN) IND AT 7,000 FT, 12,000 FT, & 17,000 FT RESPECTIVELY, F/A REPORTED HEARING LEAK, TURNED BACK & LANDED WITHOUT FURTHER EVENT. MX INSP R-2 DOOR & FOUND IT SECURE WITH ALL SEALS IN PLACE, ISSUED MEL COND 1 "R-2 DOOR WARNING INDICATION INOP". MX TROUBLESHOT PER TSM & REPLACED SDAC IAW AMM, PRESSURIZED A/C, NO LEAKS NOTED. VENDORS INCOMING TEST OF SDAC S/N 1174 CONFIRMED REASON FOR REMOVAL, SYNCHRO INPUT TEST FAILED DUE TO DEFECTIVE INPUT 2 BOARD. REPLACED DEFECTIVE INPUT 2 BOARD AND PERFORMED FUNCTIONAL TEST IAW CMM 31-55-34, REV. 9.