As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF DURING GEAR RETRACTION MASTER CAUTION HYD AND FLT CONT ILLUMINATED WITH BOTH ENG AND ELEC HYD A SYTEM LOW PRESSURE LIGHTS ILLUMINATING FOR 10-15 SECONDS. GROUNDED - YES. AIR TURNBACK - FOUND A EDP DEPRESSURIZATION SOLENOID CANNON PLUG BACKED OFF. R ESSARY 82391. REPLACED MW0312 HARNESS REF MM71-51-03-400-801-F00. OP CK'S GOOD. (REF 60564037 AND TSR715094)