Mack ECM password

[Truckdriven]

I have a 2000 Mack RD688S that we did a 8 spd to 13 spd transmission conversion and the PTO gear ratio is slightly slower on the new trans . The truck has a bulk feed body that needs to run at a set speed to unload and has a remote high idle switch at the back of the truck and I need to reprogram the ECM to run the engine at a different speed. I have a NexiQ 2 adapter and the V-MAC III software and am able to connect to the ECM but whoever previously set the parameters put a password on that I cannot make any changes. I contacted the company who installed the body and they said they don't do those settings that the original owner would have had to get that set up.

Anybody have any solutions other than paying the dealer several hundred for a reflash? I already tried 0000, 1234, engine ser#, vin#, and everything else I could think of.