Kernrechtsfrage
Whether res judicata barred the rent reduction because a heating defect in the tin-shop area had allegedly already been considered in earlier litigation.
Extrahierter Entscheid
The complaint failed because the cantonal judgment did not grant any reduction for absence of heating in the tin-shop area.
Extrahierte Begründung
Since the challenged decision did not base the 5% reduction on the alleged heating defect, the res judicata argument was irrelevant.