Neu 1515 1y rotor rebuild kit

[luvsrc]

HI i bought neu 1515 i y 2200 kv about 3 years ago here and it stopped working spins fast but when you put my 1/8 truggy on the ground the motor spins but my truggy just creeps did not have the chance to open the motor but was wondering where can i get it serviced at and how much wll it cost me?or DOES NEU sells rebuild motor kits for these? thanks ,kinda hard to open the end bell for it doesnot have screws on it.