Replace the PCV regardless, The One Way Valves do fail and if you turn up for mapping and it does need replacing then you have some messing about to do on the day.
Before I took my cars for mapping at R-tech on both my Edition 30 and Golf R I did...
Full Service, All Filters, Millers Nanodrive 5W40 Oil
BKR7EIX Iridium Plugs
New Cam Follower
Latest Revision PCV
Revision G Diverter
Both cars where up on stock power and torque, They also made very good figures when mapped too.
Just my two penneth