Heated Rear Window Relay

[Mark]

Went to use the rear window heater yesterday to clear condensation, heard the relay click when pushing the button but it didn't work, neither did the heated mirrors. Today I pulled the relay out and there has been some burning around one of the pins.

Is it likely that there will be more damage to the wiring or something, or could it be a case of it's just the relay that is broken so put a new one in and it will work again?

Thanks