As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT AT 1000 FT AGL NR 2 ENGINE OIL PRESS WAS FLUCTUATING AT 55 PSI (CAUTION ZONE). CAP WARNING LIGHT ON. CLIMBED TO 4000 FT, CHANGED POWER SETTINGS AND NO CHANGES IN PRESSURE INDICATION. PROCEEDED WITH PRECAUTIONARY ENGINE SHUTDOWN AND RETURNED TO DFW. REMOVED AND REPLACED OIL PRESSURE SWITCH IAW AR 72 JIC NR 79-34-61. LEAK CHECK GOOD IAW ATR 72 JIC NR 79-34-00. REQUEST FCF.