Not a bug, but I can't find any documentation on this so I'll ask here. Yesterday I took off from KSAN using normal procedures, and about 60 seconds after takeoff I got a fire bell and the WHEEL WELL annunciator behind the throttles lit up red. What could have possibly caused this? I'm fairly certain the parking brakes were off when I hit the TO/GA button and I do not have any random failures enabled in the FMC. 

 

Thanks.

What could have possibly caused this

 

Your brakes were too hot or it's a service-time based failure.

 

 

 

I can't find any documentation

 

You have a fire in the main wheel well. Page 8.22 (194 in the QRH .pdf file) of the QRH (Quick Reference Handbook) will give you the correct procedure to follow. Basically, lower the landing gear and land at the nearest suitable airport.

Thank you!