What was found
"AFT CARGO DOOR" EICAS MESSAGE CLIMBING THROUGH FL210 (APPROX)(<P>RE-OPENED DMI 208833 PER MEL 52-27-01-01 CAT C DUE DATE 26MAY24. MCC NOTIFIED. PLACARDS INSTALLED. C/W MX PROCEDURES. RE-INSPECTED PRIOR TO EACH DEPARTURE.</P> / <P>LP 1813181 P1: REPLACED S208 AFT CARGO DOOR SENSOR IAW AMM 52-71-01. VERIFIED S208 INDUCTANCE WITH LCR METTER IS GOOD IAW AMM 32-09-13. PRESSURIZED A/C IAW AMM 05-51-24 TO 4 PSI. NO INDICATIONS NOTED AT THIS TIME. THIS CLEARS DMI 208833.</P>)