Does anyone have the procedure for doing that?
I know that in the calibration manual the default password is 1234. I assume the password was previously changed. I'd contact Fluke and see if they have a service manual. Maybe there's an internal jumper that overrides it like the 3458A.
I put in a support ticket this morning and they just wrote me back.
"You would need to send this unit in to get the password back to factory default. Contact our Service department at 1-888-993-5853"
Probably not the answer you wanted to hear...
Fluke does have a default password for maintenance. For example the password for a 1521 thermometer is 1251 (reverse). You might try 0457 or 4570.