What was found
CLE - FLT 3392 - THE CREW REPORTED THAT AFTER GEAR RETRACTION, ALL THREE 'B' SYSTEM RED LIGHTS REMAINED ILLUMINATED FOR 45 SECONDS AFTER GEAR WAS APPARENTLY UP. THE AIRCRAFT LANDED AT CLE WITHOUT INCIDENT WHERE MAINTENANCE FOUND THE GREEN HYDRAULIC SYSTEM TO BE LOW. MAINTENANCE SERVICED THE AFFECTED HYDRAULIC SYSTEM, AND PERFORMED GEAR EXTENSION/RETRACTION IAW EMB120 MM 32-32-00, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)