What was found
AURAL WARNING SOUNDED CONTINUOUSLY INFLIGHT NO LAND 3. PERFORMED MCDP TEST 30/40 WITH NO FAULTS FOUND. LAST FLIGHT FAULT WAS "RUD SRVO/FCC C" DIAGNOSTIC CODE 131361. REMOVED AND REPLACED LEFT AND RIGHT SIREN/OWL CARD MODULE (M999 & M619) IAW 757 AMM 31-51-04- 4. TESTS NORMAL. OK FOR SERVICE. TSI 31-50/8687. 2>DUE TO DELAY IN SJO CAUSED BY AURAL WARNING ISSUES PLEASE TROUBLESHOOT PER 757 FIM 31-51 FT 814 AND REPAIR ALL FAULTS FOUND. COMPLETE 3>DUE A PREVIOUS FAULT ON THE CENTER FCC PLEASE REPLACE UNIT AS A PRECAUTION PER AMM 22-11-01. . COMPLETE 4>PLEASE INSPECT THE THE P51 CARD FILE AND SURROUNDING AREA FOR ANY SIGN OF WATER ACCUMULATION . COMPLETE