What was found
ELECTRICAL BURNING ODOR IN COCKPIT. RTFL. AFTER CONFER WITH CAPT, REMOVED CAPTS SIDE PFD & ND, CHECKED AREA FOR ELECT BURN ODOR & DAMAGE, NONE FOUND, EQUIPT COOLING NORMAL. REPLACED AND TESTED CRTS, CKS GOOD. FOUND AVIONICS COOLING FILTER HEAVILY SOILED. REPLACE AVIONICS COOL INLET FILTER. AEVC CFDS TESTS CKS PASSED. PRECAUTIONARY REPLACED BOTH THE LT & RT RECIRC FILTERS. CHECKED RECIRC SYSTEM, BOTH FANS OPERATE & NO ODORS PRESENT. ACP'D CABIN PRESS TO 5.3 DP FOR 57 MIN DURATION PRECAUTIONARY, NO ABNORMALITIES NOTED.