The requirement of replacing the engines became apparent after an investigation into the aberrant behaviour of the Falcon 9 rocket observed during a recent non-NASA mission launch attempt, Space.com reported on Wednesday.
Originally scheduled for October 31st, the planned six-month mission was delayed as Elon Musk-run SpaceX evaluates off-nominal behaviour of Falcon 9 first stage engine gas generators observed during a recent non-NASA mission launch attempt.