I worked with a guy 2nt and while riding to the game he asked me the following. "Last week I was the lead and a pass went to the backcourt and was slightly touched. The trail did not see the touch, it was barely noticable, so he called over and back. Should I have change the call."

I said I didn't think so, but would get input on the board with some more "experienced" officials. I think this is different than a ball going OOB's which you may talk to your partner, and end up changing the call.

Would you do it, and CAN we. I know it is not a listed "correctable error", but I don't think it falls into that "category" either.

You are PARTLY correct.

He should not change the call, but he SHOULD have given the information of the tip to his partner, to allow his partner to get the call correct.

On a "slightly touched," I'm not sure. I've got to be 100% positive before I offer unsolicited help. If he asked you, I'd tell him. But, if you're 100% positive that the ball was tipped last by the defense, go have a short private talk with him and let him decide whether to change the call. It's still his call in the end, and he'll have to live with it.
If he changes it, call it an inadvertent whistle and give the ball back to the offensive team (if they secured control.)
I had a partner come to me this year in varsity boys game and ask me if it got tipped. He had his back to the play talking to the coach (he admitted later that was a mistake) and came to me for help after the home crowd went bonkers on his call.

If I make this call and partner comes to me and tells me that the ball had been tipped, I will change my call 100% of the time. (Well, I won't if I'd seen the tip, but then seen a second tip by the offense that my partner had missed...)

Remember to set the shot clock back to where it was if the timer accidentally reset it.

Get the call right
 

Our job as an officiating team is to get the calls right to the best of our ability and judgment. I agree with blindzebra; in this case, give the partner information that s/he can use to make the correct call.