Big Airways used to run a 'STAC' system. Suspect parts were removed, tagged with a STAC label and placed in a separate storage area. Subject To Aircraft Check they would be declared either 's' or 'u/s' after a few days depending on whether or not the removal cured the fault or not. It was, however, limited to mainly 'black box' type LRUs that were not contaminated with fluids or dirt.
I don' know if they still use the system.