If you redeploy a component from the workbench, trace for that component is returned to its default setting of none.
mqsichangetrace UserNameServer -t -b -l none
where:-t specifies service trace
-b specifies that trace for the agent subcomponent of the specified component
is to be stopped
-l specifies the level of trace (in this case, none)
F MQP1UNS,ct t=yes, b=yes, l=none