What was found
DURING GEAR RETRACTION, LANDING GEAR IN TRANSIT LIGHT REMAINED ON AND HYDRAULIC LOCKDOWN LIGHT ILLUMINATED. ACCOMPLISHED QRH & SELECTED PUMP SWITCH TO "OVER RIDE". AFTER A SHORT DELAY, HYDRAULIC MAIN PRESSURE RETURNED TO NORMAL. CONTINUED IAW HYDRAULIC PROCEDURE NR 3. PRECAUTIONARY PROCEDURE, RETURNED TO DEPARTURE. PERFORMED OPS TEST OF THE HYDRAULIC SYSTEM IAW AMM 29-10-00.