AN ATR 72-200 INFLT DIVERTED AND SHUT DOWN THE R ENG DUE TO LOSS OF OIL PRESSURE AND QUANTITY CAUSED BY THE OIL COOLER LINE NOT SECURED.

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UPON COMING ON SHIFT; I WAS GIVEN VERBAL TURNOVER THAT ACFT R-HAND ENG REQUIRED OPS CHK OF 'A' IGNITER. THE ONLY REMAINING DISCREPANCY WAS THAT THE #2 ENG FIRE HANDLE WARNING WAS ILLUMINATED. I REMOVED THE FIRE LOOP CANNON PLUG FROM THE FIREWALL TO TROUBLESHOOT THE PROB. FOUND WATER IN THE CANNON PLUG; CLEANED IT AND RECONNECTED -- THE SYS OPS CHKED GOOD. I PERFORMED A SYS OPS CHK OF IGNITION SYS A AND B OF R-HAND ENG. THE SYS OPS CHKED GOOD. I CLOSED UP THE R-HAND ENG. I DON'T RECOLLECT AT THIS TIME SEEING A ROLL OF SAFETY WIRE BEFORE CLOSING THE ENG COWLS OR ANY LOOSE OIL LINES. I DO RECALL CLOSING THE AFT COWL. I KNOW I DIDN'T REMOVE THE MAINT STAND AND AM UNSURE IF I CLOSED THE FORWARD COWL. ALL WORK I PERFORMED WAS ON THE R-HAND SIDE OF THE ENG. SUPPLEMENTAL INFO FROM ACN 511446: STARTED PULLING IGNITION LEAD OUT; FOUND THAT IT WAS MISRTED AND WOULD TAKE DROPPING LOWER COWL TO CORRECT IT. REINSTALLED R-HAND IGNITER AND LEAD AND SAFETIED. CLRED LOWER COWL OF FOD AND WASHED. REINSTALLED LOWER COWL AND BOLTED AND SAFETIED THE BOLTS AND NUTS ON THE R SIDE. INSTALLED R-HAND OIL COOLER LINE AND TORQUED. INSTALLED 5 LOOPS AND SAFETIED. THEN INSTALLED ENG DRAIN LINES OIL ON THE R SIDE. THEN TURNED OVER WORK TO SECOND SHIFT. LEFT THE ACFT AND DID ACCOUNTABILITY CHK ON TOOLS.