Here is the title and a synopsis of the episode.
5. KRYSIS
Kryten has a mid-life crisis and changes his body cover from Mech grey to Ferrari red. The posse try and show him how much he's achieved in life by taking him to visit a mechanoid from his old fleet.
Are they sure it's Mech Grey? Maybe it's Ocean Grey or Military Grey?
Amazing how they just keep finding these Mechanoids still functioning after millions of years.
They built those things to last!