Spares/repairs - very loud lawnmower (Low Fell NE9)

Bosch electric lawnmower, about 12 years old. I accidentally hit it against some gardening shears hidden in long grass - it still works but is now **deafeningly loud** when running (would cause hearing damage if used without ear protection and I worry about disturbing neighbours with how loud it is) - hence listing it as spares/repairs.