What was found
AVIONICS SMOKE WARNING ON TAKEOFF. WARNING CONTINUED UNTIL SHUTDOWN. EMERGENCY DECLARED. CONFIRMED NO OIL/HYDRAULIC ODOR IN FLIGHT DECK, AVIONICS COMPARTMENT. OPENED C/B 1WA (F25) AND NO ALERT MESSAGES OR FAULT LIGHT. SMOKE DETECTOR 13WA REQUIRES REPLACEMENT. C/B 1WA (F25) OPENED TO FOM. T/S PER ABOVE REF STEP 4, REMOVED AND REPLACED FLIGHT DECK SMOKE DETECTOR 13 WA IAW AMM 26-15-12-04. PERFORMED AVIONICS COMPARTMENT SMOKE DETECTION ADJUSTMENT TEST IAW AMM 26-15-00-05-0. OPS CHECKED GOOD. FOUND NO SMOKE ODOR, NO EVIDENCE OF BURNING OR FIRE. ACFT OK FOR SERVICE