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.
Area Heating. If the room the turtle is being kept in is always over 75 F (23.8 C), then you will only need to heat up a basking area, rather than heating up the room, too. Using an incandescent light or spot light, allow the area closest to the light to reach 85-88 F (29.4-31 C).