MY PASSENGER SEAT'S POWER SEAT IS PARTIALLY OPERATIONAL. THE SEAT WORKS UP AND DOWN AND RECLINES, BUT WON'T GO FRONTWARDS OR BACKWARDS. THE MECHANIC SAYS THE FRONT/BACK MOTOR WORKS AND THAT THE TEETH IN THE RAILING MAY BE STRIPPED. DOES ANYONE KNOW THE CORRECT TOYOTA PART NUMBER OR HAVE ANY SUGGESTIONS. THE ONLY OTHER OPTION, I BELIEVE, WOULD BE TO BUY THE WHOLE ADJUSTER ($1,400)??