The 2000/2015 series used the one-line VFD with "British flag" characters, so our menu options were much more limited. If there is a secret menu in there, it would be accessed by those same two keys since they share front panel processors, but it has been too many years and I can't recall if the one-line display family has it or not. If there is, then it would also be in the 2700 family as well. I believe the 6517 and 2182 meters also have it since they share the two-line display. The analog guys found that having some of these hidden options easily accessible without a magic SCPI command made their debugging a lot easier, and some options (like the design team) I put in just for fun.
The secret menu goes by key position, so if the key labels are different, then look at a 2001 front panel to see which 2000 keys would correspond to "FREQ+MATH" or "TEMP+LEFT" on the 2001.
The 2001 was my first project there when I started in 1991. I worked on 2001/2, 2000, 2010, 2700, 7001/2, 2400 (& family), 6517, and 2182 during my 14-year tenure there.