What was found
AIRCRAFT WAS GROUNDED: NUMBER 1 ENGINE LOW OIL PRESSURE. 28-30 PSI AT 93.6N2. RETURNED TO DFW, DID NOT DECLARE EMERGENCY. FOUND CLASS 3 FAULTS FOR OIL PRESS XMTR 1 (4003EN) OR LOW PRESS1 SW (4001EN) IN #1 EIU HITTING OVER THE LAST FEW DAYS. UPON INITIAL INSPECTION, OIL LEVEL WAS APPROPRIATE, AND NO LEAKS OBSERVED UNDER ENGINE OR IN ENGINE COWLS. MAINTENANCE REPLACED OIL PRESSURE TRANSMITTER IAW AMM 79-33-15.