9 Stages of a citta. Going from pure to contaminated:
1) citta
2) mano
3) manasan
4) hadayan
5) pandaran
6) mana indriyan
7) manayatana
8) vinnana
9) vinnanakkhandha
-Vinnana and vinnanakkhanda come at stages 8 and 9.
-An Arahant’s citta does not go beyond nor contaminate beyond stage 3: manasan.
So how can an Arahant have any vinnana?