A very small quantity of Workgroup Server 9650/233 computers, M5646LL/A, may have an issue with the Velcro straps that secure the Ultra wide (68 pin) SCSI cable to the internal chassis. The Velcro straps may not adhere properly to the internal chassis and/or bottom drive carrier, causing the Ultra wide SCSI cable to come loose in the enclosure and rub against the fan on the side access panel. A very small quantity of units with this potential issue, have gotten into Apple Computer's U.S. distribution. This issue is not present with units built outside of the USA.
Replace the Velcro Tie-wraps on the affected unit, Service part number 922-310, there are two used per system. If necessary, replace the Ultra wide SCSI Cable, Service part number 922-3052.