It takes a rather unique set of circumstances to get a board to melt down completely. Most of the BGA (ball grid array) solders don't melt below 270C. Boards typically start to delaminate around 175C.
So yeah, it got a bit toasty in there... One of the reason why we call them "ovens".
As far as I know, I'm the only techie to start a fire at my old workplace. The whole building smelled like an electrical fire, and I got teased about that for a long time. Course, I was also the first person to cook popcorn when they finally got a microwave, and I managed to burn that...