What was found
LEFT MAIN GEAR TAKES APPROX 2-3 SECONDS LONGER TO RETRACT THAN THE NOSE + RIGHT GEAR. EXTENSION IS NORMAL. RED LEFT ANNUNCIATION ON GEAR INDICATION HAVE APPROX 1 SEC DELAY BETWEEN RED + AMBER EXTINGUISHING. REMOVED FROM SERVICE. PERFORMED FUNCTIONAL TEST OF THE LANDING GEAR PRIMARY EXTENSION + RETRACTION SYSTEM IAW Q400 AMM TASK 32-31-00-720-801. RETRACTION / EXTENSION TIMES ARE WITHIN LIMITATIONS. TASK STEP 4A(8) NOTE: "GEAR DOOR MUST CLOSE (AMBER) 1 SEC AFTER LDG GEAR UPLOCK (RED). FUNCTIONAL CK GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.