What was found
FLT 2404, SJU-JFK(DIVERTED TO BACK SJU). AFT T.O. LIGHT BUMPS #3 REPORTS ODOR FROM ABOVE HER JUMPSEAT. DIDNT LAST LONG AND THE REST OF THE INFLIGHT SMELLED NOTHING. LATER AT FL 340, RAIN AND MOD TUB ENCOUNTER ST. ELMO FIRE, INFLIGHT REPORTED ENTIRE CABIN FILLED WITH STRONG ODOR OF MELTING WRES OR CABLE. DECLARED EMER. ( APU SYSTEM ); PERFORMED DECONTAMINATION ON ECS (ENVIRONMENTAL CONTROL SYS) LEVEL B IAW AMM 21-00-00-615-803A AND TSM 05-50-00-810-831A. R&R OZONE CONVERTER ASSY IAW A320 AMM 21-58-42. ITEM PLACED ON MEL# 49-10-01 APU SYS. CAT.C, MX-4 UPDATED & PLACARD INSTALLED. (M) PROCEDURES C/W. MCC BRIAN NOTIFIED. MDDR# 4499623. (EMERGENCY WAS DECLARED)(SUPPLEMENTAL INFORMATION TO FOLLOW)