Water Pump Control Cable

One of our control cables routing from the heat pump water tank on level one to the PCB on the external heat pump has developed a break. This cable sends the signal from the local heat pump tank temperature sensor to the heat pump external unit. We need someone to remove this cable currently in place and pull a new cable, terminating it into the previous terminations. Given the route from level one to the externals of the ground floor, it is likely that this will require cutting into the plasterboard to get at the loom along the way of the connection to pull out the old cable and pull in the new cable piece by piece, then upon completion re plastering the cut outs. The cable currently in place is a 2 core externally rated cable which is approximately <50m.