What was found
FLT 1722 MBJ-MCO, AIR RETURN TO MBJ DUE TO ENG 2 FUEL LO PRESSURE AFTER TAKEOFF. CREW FOLLOWED QRH AND SUSPECTED FUEL LEAK ON NR 2. HOWEVER, AFTER LANDING NR 1 TANK 200 LBS LOW. PERFORMED EXTERIOR VISUAL INSPECTION OF ENGINES AND WINGS FUEL ACCESS PANELS, NO EVIDENCE OF LEAKS NOTED. SLIGHT FUEL IMBALANCE BELIEVED TO BE RESULT OF QRH PROCEDURE 6-8. EICAS MESSAGE WAS DEFERRED PER MEL 73-31-07 CAT C (MDDR #128607). TECHNICIAN ON T/S FOUND NO CORRELATED FAULT VIA CMC. PERFORMED E190 FIM 73-31-00-810-804-A. TRANSITORY CONDITION: CUSTOM I/O MODULE 2 ( MAU3-MOD.7/8). RAN NR 2 ENGINE, NO FAULT FOUND IRW E190 AMM 71-00-01-910-801-A. PLACARD REMOVED, MX-4 UPDATED.