The Fleet Repair Ship was a type of auxiliary support ship used by navies in the Post Diaspora era.
Such ships were used in the repair of battle damage to warships should that damage prevent the warships returned to a proper shipyard.
In 1921 PD, HMS Hexapuma of the Royal Manticoran Navy required the services of HMS Ericsson, a fleet repair ship, so that she could return to the Manticore System through the Manticore Wormhole Junction following the Battle of Monica. (SI1,SI2)