As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2126 - NOSE DOOR ADVISORY LIGHT REMAINED ILLUMINATED AND NR 2 HYDRAULIC PRESSURE DROPPED TO ZERO WITH NR 2 ENGINE HYDRAULIC PUMP CAUTION LIGHT ILLUMINATED. AFTER CHECKLIST PRESSURE READING TO NORMAL AGAIN. ACCOMPLISHED ALTERNATE GEAR EXTENSION AND LANDING NORMAL. MAINTENANCE FOUND AIR IN NR 2 HYDRAULIC SYSTEM. SYSTEM BLED AND SPECIAL INSPECTION COMPLIED WITH. SYSTEM CHECKS GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.