1) The seller is liable in accordance with the contract and this
Convention for any lack of conformity which exists at the
time when the risk passes to the buyer, even though the lack of
conformity becomes apparent only after that time.
(2) The seller is also liable for any lack of conformity which
occurs after the time indicated in the preceding paragraph and
which is due to a breach of any of his obligations, including a
breach of any guarantee that for a period of time the goods
will remain fit for their ordinary purpose or for some
particular purpose or will retain specified qualities or
characteristics.
Article 37