Hello Stu,
I had problem with passenger seat not working properly one day I decided to try and sort it,the front seats in a Lexus are so easy to take out four bolts hidden under carpet covered caps that pry off.Just by removing the 2 front bolts enabled me to lean seat back enough to see workings underneath.You can still control seat movements while seat leaning back and you may be able to see why seat is twisting.Hope this is some help mate nothing more annoying than a crap seat in a luxury car,chers Den