MASBUS

The multi-adapter bridge detected a problem with a connection to a PCI adapter that it controls either in a physical card location or embedded in a FRU.

1. Are you working from the serviceable event view and a card location is listed with this FRU?
   • Yes: Then the listed card location is where the error is located. Continue with the next step.
   • No: Record the bus number value, BBBB, in word 7 of the reference code (see Breaking down a RIO/HSL or PCI bus reference code). Search for the bus number in the resource view available to you on the HMC or operating system, or in the System Configuration Listing, to determine which system unit or I/O unit contains the failing component. Record the unit's machine type, model, or feature and continue with the next step.
2. The failing component is the FRU containing the physical or embedded card slot that is controlled by the multi-adapter bridge. Identify the system model, I/O unit, or machine type that is indicated by the location in the serviceable event view, or by using the bus number. Use the following table to find the appropriate service information.

   Table 1. Failing component service information for MASBUS

   Model or expansion unit	Name of FRU to exchange	FRU location	Link to locations information
   515, 520, 525	System unit logic planar	-P1	Locations — Model 515, 520, 525
   550 and OpenPower® 720	System unit logic planar	-P1	Locations — OpenPower 720 and Model 550
   570	Logic planar for system primary unit or secondary unit	-P1	Locations — Model 570
   575	System backplane	-P1	Locations — model 575
   5074, 8079-002, 8093-002 expansion I/O tower	Tower card	CB1	Locations — 5074, 8079-002, and 8093-002 expansion I/O units
   5079 expansion tower	Tower card	CB1	Locations — 5079 expansion I/O unit
   5088, 0588 expansion unit	Tower card	CB1	Locations — 5088 and 0588 expansion I/O units
   5094, 5294, 8094-002 expansion I/O unit	Tower card	CB1	Locations — 5094, 5294, and 8094-002 expansion I/O units
   5095, 0595 expansion tower	Tower card	CB1	Locations — 5095 and 0595 expansion I/O units
   Type 1519 — external xSeries® server	Integrated xSeries adapter card	Follow the RIO/HSL cables	Locations — Integrated xSeries adapter card (IXA)
   7311-D10, 7311-D11, and 5790	I/O unit logic planar	-P1	Locations — 7311-D10 and 7311-D11 and 5790 expansion unit
   7040-61D	I/O unit logic planar	-P1	Locations — 61D
   		-P2