ECU522739-5 is open circuit in Heated Oxygen Sensor
possible cause:
Heater supply/drive open circuit
sensor failure
functional failure in controller

VSM524263-1 is Uncommanded Power Down
possible cause:
TCU program corrupted or TCU application file mismatch
functional failure in controller

VSM2023-12 is canbus error with display
possible causes for this error are:
termination resistors open circuit
open/intermittent circuit on can HI, can LO
can HI and can LO shorted together
open circuit on power/ground to can connected devices
STG on can HI
STS/STB on can LO
can connected device failure

Check all wiring and connectors and make sure they are in good order, fully plugged in, make sure no broken wires, corroded connections, all ground connections are good, and check all fuses to make sure none are blown.

If you find no issues there then try clearing out the codes, generally if you turn off the key (for no less than 30 seconds) the codes should clear, if not then you will have to go into the DSC and check truck serial number and make sure it matches the dataplate. A software update may be required.
Generally these type errors are caused by a connection issue but ultimately could be a component failure.
A call to your local hyster dealer to get a qualified tech to look at this may be required.