The device terminating plug might be failing.

1. Find the IOA type:
   1. Find the IOA location information in the Service Action Log if it is available. If the location is not available, find the address of the IOA (see System reference code (SRC) address formats, or see "System reference code (SRC) address formats" in the service guide for the system unit.) Use the address to find the location (see Locating FRUs, or see "Locating FRUs" in the service guide for the system unit.
   2. Find the IOA card in the system and read the type number of the card at that location.
2. Use the information in the following list to determine the failing terminating plug:

   Storage IOA type	Action
   2749	For device types 3490, 3570, 3590, 3995, and 7208, see . For all other devices, use part number 85F7887.
   5702	Use part number 19P0874.
   All others	The terminator is integrated into the backplane and not a separate failing item.

3. Exchange the failing item.
   Note: If the terminating plug is located on a backplane, go to symbolic FRU BACKPLN. Follow the procedure until the terminating plug is accessible and then remove or exchange the plug.