120000km service (type B)

[shoop]

I've just got my hands on a April 2011 LX TDCI that's done 129000kms, but the service book doesn't have an entry for the 120000km service, and although it has definitely just had a normal oil and filter change I don't know if the extras for a B type service have been done e.g. the transmission fluid and filter change. Is there a reliable way to check if the transmission fluid needs to be changed or should I just assume that it needs it and get it done?