There are many springs that have to go a certain way. It is best if you get a shop manual from the parts store for your car.
www.autozone.com is a wealth of information with pictures, too.Click on the left side where it says Repair Info. Select 1993, Then Pontiac, Then Bonneville, then water pump. It helped us.
haynes repair manual about 20$ AUTOZONE
The question you ask is too involved for a proper answer. You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
For such a large job, if it is not obvious to you, you should be using a repair manual, or take it to a competent shop.
Reset with an OBD2 scan tool, after the repair of whatever triggered the light.
It is inside the side cover of the transmission. I have seen this with the trans still in the car but it would have been easier to take the transmission out to repair it.
If your Pontiac runs a 700r4 gm transmission you have stripped a reverse input shell. The transmission needs to come out for repair.
http://www.tradebit.com/filedetail.php/9052736-instant-download-service-manual-triumph-bonneville-bonneville
A repair shop can release a car with bad brakes if they were not asked to repair the brakes or the customer refused service. It is then the responsibility of the customer to have them repaired.
There are some mechanics that do know how to repair car brakes. If you wanted to find out who repair car brakes, you can ask around in the neighborhood or ask a family or a friend.
Purchase a repair manual at most parts stores, ( around $12 ) for detailed instructions on this and many other repairs.
Are you certain that it needs actual repair and not just recalibration?