HP M81289-002 is the IEC62368 power supply board identified for the HP 27xq monitor. It is a service part for restoring the monitor’s power board when that component needs replacement.
This specific version is listed as 5E.45202.002. The 27xq service guide distinguishes it from the separate 5E.45202.001 board, so M81289-002 identifies the IEC62368 variant for this monitor model.
The part is listed for purchase by HP-authorized repair centers for monitor service.