The system detected an excessive number of availability state changes for an External Time Reference (ETR) port. ETR is the MVS™ generic name for the IBM® Sysplex Timer (9037) or equivalent.
The system disables the port.
Check the system console associated with this processor. If you have already contacted the IBM Support Center, no further action is required.
Otherwise, contact 9037 hardware support. Note that the same event might occur on more than one of the processors in a sysplex.
Timer supervision
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