Diagnosed honestly, including when the answer is that it is not worth doing.
Slipping, delayed or harsh shifts, shuddering under light throttle, or red fluid on the driveway all point here.
Some of it is a service and a fluid change. Some of it is a serious repair. We find out which before quoting you anything.
If the cost of the repair exceeds what the vehicle is worth, we will say so rather than take the job.