NHTSA Complaint #10720988 — 2003 LEXUS ES300

I PURCHASED A USED 2003 LEXUS ES30FROM USED CAR DEALER. AFTER A COUPLE DAYS OF DRIVING IT I NOTICED IT WAS SHIFTING GEARS INNORMALLY. IT WOULD SURGE UP TO 4000RMP BEFORE SHIFTING TO 2ND GEAR AND AT ONE POINT WASN'T MOVING WHILE I HIT THE GAS THE ACCELERATION VERY FAST OUT OF NOWHERE. MY MOTHER ALSO HAD THIS SAME YEAR MAKE AND MODEL VEHICLE A FEW YEARS BACK AND IT HAD THE SAME PROBLEM BEFORE THE TRANSMISSION WENT OUT. I DID SOME RESEARCH ONLINE AND FOUND MANY OTHER LEXUS CUSTOMERS EXPERIENCED THE SAME PROBLEM. I FOUND A WEB SITE THAT CLAIMED THAT THERE WAS A TSB PUT OUT FOR THIS VEHICLE AND THAT THE LEXUS/TOYOTA DEALERSHIPS WOULD FIX THIS PROBLEM WITH AN UPGRADE. I WAS WONDERING IF THIS UPGRADE IS STILL AVAILABLE AND IF MY VEHICLE WOULD QUALIFY? AND IF SO HOW WOULD I GO ABOUT THIS PROCESS.