As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND NR 1 ENGINE IDG DELTA P POPPED. THIS IS THE SECOND DPI EXTENSION OCCURRENCE. PERFORMED FIM TASK 24-11-00-810-803 (DPI). INTERROGATED NR 1 ENGINE FMC CDU FOR FAULTS NONE NOTED. REPLACED IDG SCAVENGE AND CHARGE FILTERS REF MM 24-11-41. NO CONTAMINATION NOTED. PERFORMED ENGINE IDLE LEAK CHECK, OPS CHECKED NORMAL DPI NOT EXTENDED ACFT. OK FOR SERVICE.