Try calling the manufacture. Many times if you talk to someone on the phone you will find that the company is set on keeping you a customer. You might get a replacement or at least a discount on a new pair. No guarantees, but it doesn't hurt to ask.
If the company isn't any help, try finding out where the water is entering the bootie on the outside of the waders. Do this by filling the inside of the leaky leg with water. Mark wherever there are leaks out.
Then find out where the leaks are coming into the inside of the booties by turning the leg inside out and filling/marking.
After you have marked the leaky areas, let your waders dry and then treat with aquaseal.
The tricky part about getting the aquaseal to actually fix the leak is because of the location of your leak. There are so many seams, water can enter in one place, and then travel along the seam and enter the wader somewhere else along the seam. That is why you need to treat both the outer and inner surfaces. If you can, thin the aquaseal with toluene, you will have a better chance at creating a seal against the waders membrane, which is the only way to effectively seal them. If you don't get a good seal to the membrane, water will squeeze under the aquaseal and travel along the tunnels created by the tricot lining on the inner side of most waterproof/breathable fabrics.
Good luck, and definitely try calling the manufacture. Sometimes the waders are just too shot to fix.