Gearbox Help - Symptom B285

I was wondering if anyone could help.

I have a piece of paper stating that gearbox work was carried out on my clio on the 7th September 2012. It doesn't state anything more, other than there is a Symptom called B285. Does anyone know what this means/stands for? Hoping it maybe means a gearbox replacement or work done?

Many thanks,

Greig