As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. RETURN TO GATE. LEFT ENGINE N1 TAKEOFF, REF 93.0 RT ENGINE N1 93.7 A/C SYSTEM RUNS HOT. SUPPLEMENTAL REPORT: SECURED LOOSE SENSE LINE ON RIGHT FLOW CONTROL AND SHUTOFF VALVE AND OPERATIONAL CHECK GOOD, PER AMM 21-51-01.