I think Perm11FO is referring to the "Discr" hyperlink on the left of each deadhead under the Travel Bank section of the Travel Related Expense Report for each month. But, I agree with FDXLAG.

You can only change a fare to a higher amount if you actually fly the deadhead as scheduled, or if the fare listed is lower than the accepted fare as published in the bidpack or on the pairing.

I've had zero success getting them to change the accepted fare to a higher actual ticketed fare amount if I have deviated on the deadhead.

Perm11FO, have you had a different experience? Have they changed an accepted fare to a higher actual ticketed amount, when you have deviated?