What was found
WHEN LANDING GEAR WAS LOWERED AVIONICS SMOKE WARNING CAME ON - THERE WERE NO OTHER INDICATIONS OF SMOKE - WARNING WENT ON/OFF EVERY 5 SECONDS -AFTER LANDING AND TAXI - IN MECHANICS AND FIRE RESCUE FOUND NO EVIDENCE OF SMOKE - ALL WARINGS CEASED WHEN ENGINES WERE SHUTDOWN. TSM 26-16-00 AVIONICS SMOKE TEST NORMAL. CLEANED BACK OF MTP SMOKE TEST PANEL IAW SMP, INSP. CONNECTOR AT SMOKE DETECTOR 13WA, CK'S GOOD. REPLACING SMOKE DETECTOR, PRECAUTIONARY, IN WORK. REPLACED AVIONICS SMOKE DETECTOR 13WA IAW MM 26-15-12-4 TESTS OKAY. RAN APU WITH PACKS FOR 15 MIN, ALL INDICATIONS NORMAL, OKAY TO CONTINUE.