As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM DURING PUSH BACK, THE PNEUMATIC WAS NOT ENOUGH TO START THE ENGINES. THE ENGINES WERE STARTED WITH EXTERNAL PNEUMATIC PLANT IAW MM 49-50-00, TESTED CORRECT AND THE PNEUMATIC AUXILIARY POWER UNIT WAS DEFERRED IAW MEL 49-7. DURING TRANSIT SERVICE, OPERATIONAL TEST WAS PERFORMED TO PNEUMATIC AUXILIARY POWER UNIT WAS PERFORMED IAW MM 49-11-00, TESTED CORRECT, DEFERRED REPORT WAS CLOSED.