The initial problem with Mark McCann's Bugatti Veyron gearbox is theorized to have started when a garage drilled out a rounded sump plug, introducing debris.

Mark McCann's Bugatti Veyron has a broken gearbox, rendering it inoperable.

Mark McCann was scammed out of a £3,500 deposit when attempting to buy a secondhand gearbox for his Bugatti Veyron.

Pascal found swarf in intricate oil cooling channels of Mark McCann's Bugatti Veyron gearbox, but no obvious damage to gears.

Mark McCann bought a Bugatti Veyron for £900,000.

Mark McCann is seeking help from viewers to find a test rig with a filtration system that can handle 6,500 RPM, change gears, and work the clutch for his Bugatti Veyron.