As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCONTINUED TAKEOFF, DUE TO BULK CARGO DOOR LIGHT DISPLAYED ON EICAS. DURING GROUND INSPECTION FOUND 1 CARGO BOX LOCATED OVER THE BULK CARGO DOOR PROXIMITY SENSOR. INITIAL HYPOTHESIS IS THE BOX MOVED FROM THE AFT BULK CARGO AREA AND FELL OVER THE SENSOR DURING ACFT TAXING. IAW AMM 52-36-00, PG 2 OPS FUNCTIONAL DESCRIPTION ON BULK CARGO DOOR WAS PERFORMED NORMALLY IAW AMM. THE CLEARANCE BETWEEN SENSOR AND LATCH IS CORRECT.