Can't recycle the ERRORLOG - error 17049
From System Error Codes (1300-1699): OS error 1392 indicates file corruption.


  ERROR_FILE_CORRUPT
  1392 (0x570)
  The file or directory is corrupted and unreadable.


So it looks like you have corruption on your G: drive.

I would start with a chkdsk of that drive and all other drives.

Since corruption usually doesn't fix itself and can have the tendency to worsen, personally I would fail over to the other node ASAP before other files (I don't know what else lives on the drive) corrupt and the situation gets trickier and trickier.