What was found
AFTER DEPARTING, ON CLIMB OUT, PASSING 12,500 FT, NR 1 OIL PRESSURE LIGHT CAME ON AND NR 1 OIL PRESSURE INDICATED ZERO. REDUCED NR 1 ENGINE TO IDLE AND FOLLOWED ENGINE SHUTDOWN PROCEDURES IN MFG OPERATING HANDBOOK. DECLARED EMERGENCY AND RETURNED TO DEPARTURE WITH NR 1 ENGINE SHUTDOWN. AIRCRAFT LANDED WITHOUT INCIDENT. MAINT SENT, REMOVED AND REPLACED OIL TUBE LOCATED AT 3 OCLOCK POSITION AFT WITH SERVICEABLE TUBE IAW MM. OPS AND LEAKED CHECK GOOD, DURING ENGINE RUN UP IAW SEI-189. NO OTHER DEFECTS NOTED AT THIS TIME. THE AIRCRAFT WAS RETURNED TO SERVICE.