What was found
AIRCRAFT RETURNED TO IAD DUE TO CARGO DOOR LIGHT. *S/D* BUILT IN TEST EQUIPMENT INDICATED LOGIC CARD 3 FAILED IN THE PROXIMITY SWITCH ELECTRONIC UNIT. REPLACED LOGIC CARD, OPERATIONS CHECK NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT RETURNED TO IAD DUE TO CARGO DOOR LIGHT. *S/D* BUILT IN TEST EQUIPMENT INDICATED LOGIC CARD 3 FAILED IN THE PROXIMITY SWITCH ELECTRONIC UNIT. REPLACED LOGIC CARD, OPERATIONS CHECK NORMAL.