What was found
PILOT REPORTED THAT THE LANDING GEAR DID NOT EXTEND ON FINAL APPROACH, INTRANSIT LIGHT WAS ON AND NOTICED THAT THE GEAR RELAY CB POPPED, EXTENDED THE LANDING GEAR MANUALLY, LANDED SAFELY. MAINTENANCE CONFIRMED DISCREPANCY, TROUBLESHOT SYSTEM TO HYDRAULIC POWER PACK INTERNAL SELECTOR VALUE, REPLACED HYDRAULIC POWER PACK ASSY PN 114-388000-9 SN ON MX-549646A SN OFF MX62452A IAW BMM 32-30-02, SWUNG GEAR 10 TIMES, OPERATIONAL CHECKS GOOD.