Unlike her sister, MS Silja Serenade, the Symphony's funnel was constructed of aluminium, which made the ship less heavy.

In December of the same year her engines were upgraded with so-called water-spray technology that greatly reduced nitrogen oxide emissions.

On 6 August 2001, a swarm of fish got sucked into the ship's cooling water intakes, which resulted in the engines shutting down due to overheating.

In January–February 2006, just prior to the sale of Silja Line to Tallink, the Symphony and her sister had their interiors extensively rebuilt at Turku Repair Yard, Naantali.

During a storm on 9 January 2007 the Symphony accidentally rammed a boarding tube in the port of Mariehamn, resulting in approximately €600,000 worth of damage.