Drill - hammer action, for repair (Wallands Park BN7)

Good quality drill, stopped working in fits and starts a few weeks ago so makes me think probably an electrical problem, maybe dust affecting electrical contacts. If you have some compressed air that might sort it out.
Chuck key, instructions and case included but no drill bits.
Please say when you could connect (please suggest a few times), I can’t always answer that quickly due to work.

       
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