Like any surgical procedure, a gastrojejunostomy could result in infection or another complication. A gastrojejunostomy connects the stomach to the jejunum, bypassing the duodenum, the beginning of the intestine at the bottom of this image.
One more thing: Don't make your turtle's water temperature too warm. For most adult aquatic turtle species, 78 F. (25.5 C.) is the highest you want unless you're treating them for an illness and a veterinarian has told you to raise the temperature. Otherwise, too-warm water can encourage bacteria growth in the tank. It also discourages turtles from basking sometimes.
In the morning (when the turtle is likely to eat) it is removed from the cage and placed in a large plastic bucket with food such as earthworms. After the turtle eats, the bucket is rinsed (it helps to have two buckets per turtle) and 1 or so of lukewarm (90 degrees F) water is placed in it along with the turtle.