Cisco CATALYST 2960 - Specific Members; If you want to configure a specific member port, you must include the stack member number in the CLI notation.

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Catalyst 2960 Switch Command Reference
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Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
mls qos dscp-mutation
This example show how to remove the DSCP-to-DSCP-mutation map name dscpmutation1 from the port
and to reset the map to the default:
Switch(config-if)# no mls qos dscp-mutation dscpmutation1
You can verify your settings by entering the show mls qos maps privileged EXEC command.
Related Commands Command Description
mls qos map dscp-mutation Defines the DSCP-to-DSCP-mutation map.
mls qos trust Configures the port trust state.
show mls qos maps Displays QoS mapping information.