As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DEPARTED, AND HAD AN IDG FAIL AFTER TAKE OFF. THE APU WAS ALREADY ON PLACARD. THE FLIGHT RETURNED TO DEPARTURE. AN EMERGENCY WAS DECLARED. NR 1 ENGINE INTEGRATED, DRIVE GENERATOR HAD LOW OIL PRESSURE AND SHUT DOWN THE IDG. REPLACED THE NR 1 ENGINE IDG IAW MM 24-21-51. OPS CHECKED GOOD.