Probably fixing someone's pipework! After playing 118 games for Arsenal between 1990 and 1997 Linighan moved on to Crystal Palace, QPR, Oxford United and finally St Albans City, where he ended his career in 2000, at the age of 38.
Linighan then set up a plumbing business, Linighan Plumbing Services in Harpenden, Hertfordshire. It has done very well, not least because of Linighan's tongue-in-cheek marketing. Apparently his van is emblazoned with the slogan: Andy Linighan - Average Footballer, Excellent Plumber.