i have a 2 yr old polaris 280 installed by my PB 2 years ago, it comes on with a booster pump 3 hrs a day. lately its been moving slow. the tail has a full force of water coming out and it has suction to climb walls. I checked the tires and the back tire that aligns with the axel had all the teeth worn out. I rotated the tires and it still doesnt move. it seems like the axel is not spinning. I've never taken it apart. any advice? thanks