What was found
(AIRCRAFT NOT GROUNDED) (ATC DECLARED EMERGENCY) SIGNIFICANT ODOR PASSING THROUGH 16,00 ON DESCENT NORMAL AIR CONFIGURATION. USED CREW OXY AND PERFORMED ODOR QRH PROCEDURE. SMELL REMAINED PERSISTENT IN FLIGHT. SLIGHT DISSIPACTION ON GROUND. ACRID/MELTING PLASTIC SMELL NOTED BY CREW AT GATE IN FLIGHT DECK ONLY. / NOTE: NO ECAM FAILURES, NO CIRCUIT BREAKERS OPENED. INSP AEVC SYSTEM FOR ODORS, INSP SEPERATE SYSTEM BOXES INCLUDING THE FUSELAGE MOUNTED SYSTEM BOXES. FOUND RADAR RT HAS SIMULAR ODOR. (REF INBOUND DISCREPANCY LOG PAGE 2108101 RADAR ISSUE). REPLACED RT (1SQ1) PER AMM 34-41-33 AND EXTRACT FAN (18HQ) PER AMM 21-26-51. ALSO, OTHER SYSTEM CHECKS RELATED TO EVENT PERFORMED THIS MX VISIT.