double column machining center MCV-B. there were power supply to OSP interrupts and some parameters (MC system) messed up.
I need to set up W axis encoder offset by new. This is related to magazine chain and to attachment/ addapter cradle.
Symptoms: W axis position (any of M190 ... 199) is not recognised, W axis doesn't clamps on stop.
Unfortunatelly, command MDI or automatic M190 ... 191 doesn't gives any diagnostic or error message.
And a good lesson to have spare parameters regularly. I have only old ones, and I can't find them right now.

it's nice to communicate with smart people :)
It's done already. The right way is setting of faulty parameters using system check mode. I did other way - discovered relevant parameters (only two of them) and by method of scientific push adjusted machine axis somehow :-)
By the way. Spare parameters are usefull only when machine axes are in the same position:
magazine chain (tool pot at retract arm); crossrail (M199 ... M190); tool arm (side A or B); all intermediate tool pots; spindle indexed; and, of course, attachment/ adaptor cradle.