"Preserver" underwent a major refit in 2005, after the ship was plagued by electrical problems. However, electrical problems remained unresolved for both ships in the class. In 2010 while refueling she spilled several cubic metres of fuel in Halifax harbour. The spill, which comprised of diesel oil, was caused by a faulty drainage pipe that had not been properly inspected following a 2010 refit. The spill was contained by the navy before causing damage to the harbour itself. On 4 November 2011, after returning from sea trials, the ship smashed into a dock in Halifax harbour, suffering damage above the waterline on the starboard bow. The commanding officer of the ship was later removed from his post as a result of the crash. The cost of the repairs to the damage sustained during the incident was $497,442.