It was when cold but remained through test drive as it warmed up to temp. Im afraid theres no others about they have got scarce mostly replaced with tms at this stage. Good news is she has a full new set of brakes i suppose.It’s rarely one bearing alone fails in a gearbox unless it was a high up bearing. If swarf from a worn bearing or worn brakes gets around the box before the filter it won’t do any good. Did you hear the noise when hot or cold? Can you find another identical tractor to compare sounds with?