Making repairs beneath the pavers will be like replacing a damaged paver. Remove the pavers necessary to make repairs to water lines, electrical conduits, etc. When refilling the base rock remember to compact it firmly just like during the original installation. Screed some bedding sand and re-install pavers. Be sure to replace the joint sand and compact the pavers to complete the interlocking system. When carefully done, the repair site is completely unnoticeable.