If you have done all tests and have norrowed it down to the gaskets, built in steps, light, skimmer, what are some of the best methods one for testing and two for sealing up. I have tried to dye test on the sides of the white strip but not screws and do not knonw how to test screws other then tighten them. Any suggestions on how to detect leaks in gaskets. Also details on how to seal up if leak is found and where to apply flexible sealer if needed. I also have a leaktraker.

Dye test, dye test, and dye test until you find it!
There are too many different techniques for gaskets, steps, lights, skimmers to fit in this responce. Call me if you need to.
Bruce
poolrepairdiver.com

gasket leaks are very rare.

I disagree rwaibel above-in our area-eastern Canada gasket leaks are fairly common. Whenever possible we replace damaged gaskets with new ones. Our trucks carry a few sheets of cork and rubber gasket material in case we dont have the actual gaket on the truck. As far as detection brrscuba is right on dye dye dye.

rwaibel:
Gasket leaks are at least a one leak job / week occurance in my area, Northeast USA. Perhaps you have different types of pools in your area.
When I'm called to a job that someone else failed to find the leak, it is one of the first things I check for. As liners are lasting longer and longer I expect to find an increase in gasket leaks in the future.
Bruce
poolrepairdiver.com

I have found that the flexible sealer works pretty good for sealing leaky gaskets, apply at the leak and the water draws it in. If the leak is to big for the flexible sealer to stop it right from the blister pack, squeeze a small amount out and let it set up some before applying it, then top off with fresh sealer.