During tear down I broke main switch
So used donor 7001 for switch and noticed that 2400/2410 use similar power supply, 14.6/6V versus 12V/5V, dimensions are identical.
Now the unit is clean, there was lot of black dust collected by high voltage like in CRT. It is pity that there is fan and electrostatic field collect it.
Calibration data is not possible to backup by one command :CAL:PROT:DATA?, there is separate set of commands for source/sense and it reads only the active range.
Unit has been calibrated 3 times and unit calibration just expired ( last week ).