What was found
IN DESCENT OUT OF FL330 GOT BURNING ELECTRICAL AND RUBBER ODOR THROUGHT ACFT. AMBER FAN ON CONDITION PAGE. REMOVED CABIN RECIREULATION FAN 15HG PER AMM 21-21-51. WATTING ON NEW FAN FOR NOW. BEFORE RECIRC FAN REMOVAL PERFORMED TEST AND SMELLED ELECTRICAL ODER AND FOUND CBX18 POPPED. REMOVED & REPLACED LT & RT RECIRC FILTERS PER A319 AMM 21-21. DURING INSTALLATION OF LT RECIRC FAN 15HG, FOUND CHECK VALVE MISSING REF A319 AIPC 21-21-02-46E ITEM 60. STILL REQUIRES CHECK VALVE & FAN INSTALLATION. INSTALLED LT RECIRC FAN 15HG AND CHECK VALVE IAW A319 AMM 21-21 OPS/LEAK CHK GOOD. (LP: 9474746, AIRCRAFT WAS GROUNDED)