What was found
THE CREW REPORTED THAT WHILE IN CRUISE AT FL 330, THE RT HYD QTY LOW MESSAGE CAME ON. COMPLIED WITH THE QRH AND LANDED NORMALLY AT THE SCHEDULED DESTINATION. MAINTENANCE FOUND THE NR 4 TIRE TREAD SEPARATED, A DAMAGED OTBD SPOILER HYDRAULIC RETURN LINE, AND DAMAGE TO THE RIGHT FLAP LOWER SKIN. A TEMPORARY LINE WAS INSTALLED, THE RIGHT MAIN SPRAY DEFLECTOR, AND ALL OF THE MAIN LANDING GEAR WHEEL AND BRAKE ASSEMBLIES WERE REPLACED. THE RIGHT FLAP ASSEMBLY IS IN WORK.