Consider yourself lucky. I took mine to a Jemca for gearbox issues. They had it a week and said the auto box was "supposed to slip gears" like that. Yeah right. A month later it was stuffed. I took it back to another Jemca, and they had it a month. They gave it back to me, and I noticed that they'd fixed the gearbox (28 days and £2200 later) and also smashed my genuine do-luck bumper in the process, to which they offered me £200 towards fixing. I told them to get stuffed and that they had to replace the entire bumper with another genuine one (so I bought 2 from Sumo power - they owe me). It took 8 months and threats of solicitors etc before they finally had the bumper replaced and sprayed. I had to take the bumper off a few weeks ago to get to the engine and noticed that they'd stripped the nuts that are fibreglassed into the bumper, so you need to get into the bumper with pliars (not an easy task) and hold the back to loosen the screws. Nightmare.
Take your car to a garage that specialises in supras and get it done right by professionals and not some jumped up tinkertoy mechanic (no offence to tinkertoy mechanics - promise)