As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING CLIMB OUT ENGINE 1 LOW PRESSURE LIGHT ILLUMINATED. A SYSTEM PRESSURE NORMAL AND QUANTITY AT 72 PERCENT. AIRCRAFT RETURNED TO PHX. EMERGENCY WAS DECLARED. DURING GEAR EXTENSION A SYSTEM PRESSURE DROPPED EXCESSIVELY BUT RETURNED TO NORMAL. REMOVED AND REPLACED SYSTEM A ENGINE DRIVEN PUMP LOW PRESSURE SWITCH PER AMM 29-34-11-000-801 AND 29-34-11-400-801.