What was found
HNL - FLT NR 702 - LANDING GEAR DOWN AND LOCK LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION WAS SELECTED. FLIGHT CREW UNABLE TO RESET. AIRCRAFT RETURNED TO HNL. MECHANIC FOUND SHELL OF LANDING GEAR PIN STILL INSTALLED IN LEFT LANDING GEAR. REMOVED SHELL, INSPECTED FOR COLLATERAL DAMAGE, NONE FOUND. AIRCRAFT RETURNED FOR SERVICE. (M)