PLC op. chip error (Saeilo)

[mach6]

We have a Saeilo FV 800-A machining center with a Mitsubishi M520A control. An alarm came up on the display and machine stopped working. The only way I've found to get rid of the alarm is to power it down and restart it, but it comes right back on after a few minutes. The alarm is displayed as follows:

PLC op. chip error
SR=0010
Error at or near $5006DC50
PC=5006DC50 SP=0000DF5C
D0=00000024 D1=FFFF0005
D2=00000000 D3=00000006
D4=000000FF D5=000053C4
D6=00000000 D7=00000000
A0=41002558 A1780000C4
A2=00030000 A3=500637D8
A4=3C80000C A5=50060080
A6=0000DFF4
tid=$

I would greatly appreciate any help!

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[mach6]

Not sure why this went under mori seiki machines. Still can't seem to find any info on this. The owner wants to scrap it now.