On Wednesday 28 August 2019, "Scillonian III" had to return to Penzance after she suffered a technical fault mid-crossing which caused the ship to be out of service for four days, leading to significant travel disruption between the islands and mainland. The mechanical issue related to a pump serving both engines' hydraulics and lubrication systems. Engineering teams in Penzance undertook a complex strip down and rebuild process to access and carry out repairs, complicated and further delayed when one of the replacement parts delivered was found to have a hairline fracture and had to be reordered.