New details about the crashed Lion Air's jet previous flight have cast more doubt on the Indonesian airline's claim to have fixed technical problems, as hundreds of personnel searched the sea a fifth day Friday for victims and the plane's fuselage.

The brand new plane plunged into the Java Sea early Monday, just minutes after taking off from the Indonesian capital Jakarta, killing all 189 people on board. Herson, head of Bali-Nusa Tenggara Airport Authority, said the pilot on the plane's previous flight on Sunday requested to return to the airport not long after takeoff but then reported the problem had been resolved.