Today (May 31, 2013) I was contacted regarding a burning smell and high temperatures around the T1/T2 controls racks.  Erwin Klassen, Bill Rawnsley, Graham Waters and myself investigated and found that the cooling fans for two power supplies on the T1/T2 control racks had failed and both units were warm to the touch.  The power supplies are labeled "T1 Power Supply" and "T2 Power Supply" in racks 1-F and 1-A respectively.  Bill Rawnsley measured temperatures as high as 90*C inside the power supply boxes using an infrared thermometer.

Small AC fans, supplied by Operations Group, were attached to each power supply behind the failed fans as a temporary measure (see photos).  Large box fans were also placed in front of the racks.  After setting up the fans the exterior of the power supplies were cool to the touch, and temperatures of about 50*C were measured inside the boxes.

The operators are aware of the situation and will check on the power supplies twice a shift over the weekend.  Repairs will be attempted on the next maintenance day.