"My" VAG technician is back to work and came by to day with a VAS 5052. The only thing it could tell us was that the transponder signal was weak. (That's directly translated from Norwegian.) Weak, wtf?
He wrote down some numbers and will email them to VAG and get my SKC. This is an old Leon, so I assume he won't need to dial up the GEKO system.
I hope I can get this code and use VAG-COM's key matching capabilities to clear out the old key-matching and re program the key.