What was found
AT 1500 AGL ON APPROACH, MASTER WARNING "AVIONIC SMOKE LITE" ILLUMINATED W/CRC, LANDED ASAP AFTER 60 SEC 500' AGL AVIONIC SMOKE WARNING DISAPPEARED. OPERATED SNIFFER FAN INFLLIGHT AND ON GROUND, INSTALLED SNIFFER FAN PER MM 26-15-21-401, OPS CHK GOOD.