The cal report may not give the correct hint.
In 1st instance it shows, that some cal values are out of range, and that's what to be expected if the unit has not been calibrated for a long time.
Well, if Ohm function has problems with zero Ohm calibration, that might be the well known problem with the input front / rear selector switch.
After years of usage (>10..20 yrs.), it will be dirty by out-gaseous of the plastic and debris, and some contacts will be hi ohm, so that you get unstable and nonsense reading in 2W Ohm, especially by zeroing.
And if the zero reading is unstable, you will get unstable full scale readings, also, which will in turn prohibit a stable cal reading.
As the lowest Ohm range is out of cal, but not the higher ranges, that gives the an indication that the problem is buried here.
You may post the 4W cal report, if available what's been wrong there.
Make a first test, simply measure a 2W short, in fixed 100 Ohm range, note the reading and switch to the rear panel, repeat the reading there, switch back to the front, and I bet the zero reading will be very different.
All may be in the dozen Ohm range, instead of < 0.1 Ohm
With that unstable switch, a calibration is not possible.
We had an elaborate thread here, what was the error, and how to solve that:
https://www.eevblog.com/forum/testgear/hpagilentkeysight-34401a-2w-problem/Frank