As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TECH SERVICE REQUESTS FOLLOW-UP TO NR 1 ENGINE IDG FREQUENT SERVICING. ACFT GROUNDED. RAN NR 1 ENG AT IDLE FOR 10 MINUTES, VERIFIED NO OIL LEAKS AT IDG, OIL COOLERS AND ITS PLUMBING. REPLACED IDG PUSH-TO-VENT VALVE IAW AMM TASK 24-11-00-700-804 AND SERVICE FITTING IAW CMM 24-11-85. FITTINGS LEAKS CHECK OK. SERVICED IDG OIL TO FULL.