MCi_STATUS

63      1                     Register valid
62      0                     Error overflow
61      1                     Uncorrected error
60      1                     Error reporting enabled
59      1                     MCi_MISC register valid
58      1                     MCi_ADDR register valid
57      1                     Processor context corrupted (making recovery impossible, although it is in theory a recoverable error)
56      1                     Signaling an uncorrected recoverable (UCR) error
55      1                     Recovery action required for UCR error
54-53   00                    Threshold-based error status
52-38   000 0000 0000 0000    Corrected error count
37      0                     Firmware updated error status indicator
36-32   0 0000                Other info
31-16   0000 0000 0000 0000   MSCOD Model specific error code
15-0    0000 0001 0010 0100   MCA code

MCA explanation:
Format  000F 0001 RRRR TTLL   Cache Hierarchy Error

F       0                     Correction Report Filtering (whether errors were skipped)

RRRR    0010                  Request (Generic Write)
TT      01                    Transaction type (Data)
LL      00                    Hierarchy level (Level 0, Micro-operation cache)