Event:PLAYER EQUIPMENT UPDATE

Occurs when you or someone around you equips or unequips an item, or switches equipment.
arg1
UnitId
arg2
Link with the name of the unit whose equipment has changed ("[Merlin]").
(This is not accurate! It will show the name of a player who has spoken last in Zone chat or a whisper.)
arg3
Unknown (0)
arg4
Name of the unit whose equipment has changed ("Merlin")
(Not accurate)