Rehab.

Noun

rehabilitation (countable and uncountable, plural rehabilitations)

1. The process of rehabilitating somebody or something.
   • The working life span of a passenger carriage, on average, is between 30 and 35 years, so a steady replacement takes place quite naturally. The life span of a station, however, cannot be so easily reckoned, for it depends largely on the rehabilitation and upkeep of the existing structures.1962 October, Brian Haresnape, “Focus on B.R. passenger stations”, in Modern Railways, page 250