What regulatory requirement must be met to allow you to repair an amateur radio transmitter on behalf of another person?

Just like installing a transmitter, repairing an amateur radio transmitter on behalf of another person is a restricted activity under Canadian regulations. Both the person doing the repair and the person who owns the equipment must be certified amateur radio operators. Because repairing a transmitter can affect its operational parameters (such as frequency stability and spectral purity), the technician must be licensed. Furthermore, since the equipment is capable of transmitting on amateur bands, the owner must also be legally licensed to possess it. Enrolment in a course is not sufficient; the actual certificate is required.