Diagnosis means, in the form of a software tool, for on-site diagnosis of a sound processor of an implanted prosthesis. The diagnosis means assesses hardware components and programming functions of the sound processor and accesses and assesses patient data stored in the sound processor. An activity log or report based on the assessment is available. Updated data and functions pertaining to a patient are retrieved and applied to the diagnosis means. The diagnosis means can replace the patient data and/or programming functions of the sound processor in the event of patient data corruption or programming function error in the sound processor. A method of on-site diagnosis of a sound processor and a process for diagnosis and repair of a sound processor of an implanted prosthesis are also disclosed.