the present invention relates to providing supplemental counts or “ clicks ” to account for recovery conditions in a document processing system . furthermore , these recovery condition “ clicks ” will be further modified depending upon the type of recovery condition encountered . the application of recovery counts thus modified when combined with the system cycle count and suitably summed will provide superior measure of the wear for a replaceable element as well as improved indication for the determination of the end of life of a replaceable element in that system . in this manner , the more timely service or substitution for that replaceable element in the system can be provided , thereby allowing costs and service down - time to be minimized .