Pioneer Elite Pro 119 won't come on.

[12rider]

It had been working well, but some times ( about once a week) it would just shut down. If I tried to turn it back on, it would work for a minute or two ( sometimes only a second or two) and shut down down again. There was no pattern to this. If left alone for a while it would work again for another week. Now it wont come on at all. It will try to and immeditly go to standby. There is a red protection led lit up on the board. I am looking for any info that may help,or a service manuel that I can download. Thanks