What was found
(CAN) STRONG CHEMICAL ODOR IN COCKPIT ON DESCENT, LASTED TILL LANDING. ON GND RUN FOUND NR 2 ENGINE N1 PROBE GUIDE TUBE LEAKING. SEALS REPLACED IAW EMM 72-23-00. GND RUN COMPLIED WITHIN LIMITS, AT 12 DROPS A MIN. BLACK LIGHT CHECK COMPLIED WITH ON BOTH ENG PRV ELBOW DUCTS & APU DUCTS WITH NIL FINDINGS. REPLACED BOTH LT & RT RECIRC FILTERS. CONTAMINATION & LEAK CHECK COMPLIED WITH SERV. C/S FOR BOTH FAN COWLS.