EE WAS LOOSENING/TIGHTENING A FITTING ON A PNEUMATIC CONVEYING LINE (FLEXABLE), WHEN HE EXPERIENCED PAIN IN HIS LEFT SHOULDER. AN MRI REVEALED A TORN ROTATOR CUFF, WHICH WILL REQUIRE SURGERY. NOTE ORIGINAL ACCIDENT REPORT FOR BACKSTRAIN 1-23-03, THIS REPORT WAS FILED 2-18-03 AFTER EE VISITED PHYSICIAN.