150.31.The consumer is released from his obligation of guarantee in one or other of the following cases:
(a) where the residual value of the goods is not specified in the contract in accordance with section 150.20;
(b) where the merchant alienates the goods in contravention of section 150.30 or where he refuses to sell the goods to the third person presented in accordance with the third paragraph of that section;
(c) where the alienation of the goods is not effected by onerous title;
(d) where the alienation of the goods is not effected within a reasonable time after return of the goods to the merchant at the end of the leasing period;
(e) where the merchant, after return of the goods at the end of the leasing period, uses those goods or allows them to be used by a third person otherwise than with a view to their alienation by onerous title.