The Aircraft DID NOT fly another comercial flight. It was ferried to Lisbon so that the TAP Portugal engineers can check it out.
SATA (est. 1942) is the oldest airline in Portugal, yes even older than TAP(est. 1945). They have only lost two aircraft in their history, an Avro Dove and a British Aerospace ATP. They take safety very seriously, there is no way they would have allowed that aircraft to continue service.