The Sensor Clean & Check service includes cleaning of the imaging sensor, mirror (if applicable), focus screen (if applicable), external LCD surfaces and the camera body.
Please note that, due to the nature of dust on sensors, there is no warranty on this service. You are advised to ensure that the body cap is fitted when the camera is sent for cleaning, and to check image quality as soon as it is returned.
If a fault is identified with your product during your requested Maintenance Service, the Canon Service & Repair Centre will contact you to either request a copy of your proof of purchase to validate your Canon warranty (if not already provided) or, if your product is no longer covered by its Canon warranty, to discuss chargeable repair options (i.e. fixed price repair, repair limit or time & cost estimate).