What was found
AIRCRAFT WAS GROUNDED: DURING TAKE OFF G ENG PUMP LO PRS ON LG RETRACT WARNING. NOSE GEAR DOORS NEVER RETRACTED. GRAVITY GEAR EXTENSION PERFORMED AND EMERGENCY DECLARED INTO CLT. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED #1 ENG EDP IAW AMM 29-11-51, AND CASE DRAIN FILTER IAW AMM 29-11-43, & FLUSHED HCU LINES IAW AMM 12-36-29.