What was found
INSPECTION TYPE-N/A, AN ARCID SMELL WAS READILY IDENTIFIED IN COCKPIT DURING DESCENT, COULD NOT BE IDENTIFIED. REPLACED LT AND RT WATER SEPARATOR BAGS, NO HELP. DURING ENGINE RUN SMELL CONTINUED. FOUND SMOKEY SMELL EMANATING FROM AURAL WARNING BOX POWER SUPPLY. REMOVED AND REPLACED SAME, OP CK OK.