Marcel Renata (left) and Hoskins Sotutu
Photo: Photosport
A fourth win of the season put the Blues level on points with the Chiefs but the visitors were already assured of second place and a spot in next week's championship final because of their five previous wins.
Tries from hooker Kurt Eklund and flanker Adrian Choat gave the Blues a 14-9 half-time lead and debutant fullback Zarn Sullivan added another soon after the break.
The Chiefs, who had six debutants in their matchday squad as they rested 11 players for the title decider against the Crusaders, drew level at 19-19 when winger Shaun Stevenson crossed the line in the 61st minute.