It is difficult to know how old they are when you purchase from the petstores.
I would change out the Reptiglo UVB light. They are not good quality & emit improper wavelength. I would recommend purchasing the Reptisun 10 tube bulb or the Arcadia D3 12% tube bulb, either one for better UVB exposure.
You can get them at www.lightyourreptiles.com
What type of thermometer are you using to measure the temperatures, a temp gun or a digital probe?
Maybe he was a little blocked up perhaps. How is he doing today?
The urates can turn a little yellowish at times, so I wouldn't worry too much about that. Are the urates soft or harder in nature?
Is he eating well right now?
I will PM you my email so you can email me pictures.
Let us know how he is doing.