The 240 backup lite all of a sudden don't lit. Check the bulbs, both looks ok. The fuze is also ok. What should I look for. Thanks.

 

There is a neutral safety switch under the plastic shifter cover inspect that.
The contacts usually get burnt over time and stop working.
If that is it you will need to replace it.
There is 2 phillips screws by it. The you should see a little tab going into a brown peice.