I would call the service manager and ask if any adjustments were made to the slide out after the motor was replaced. If so, then they need to re-adjust it again. If not, ask him why it would be dragging now, if they just had to replace the motor. Actually, if the old motor was working but the slide would just not staying in position, they only had to replace the brake on the motor and not the whole motor but no adjustments were probably made or had to for this repair.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7