We had the same alarm on one PBX. We changed the RAID card and the sata cable but the problem was still there. Mitel told us it was a software issue and to upgrade the system. We are still waiting to do the upgrade, so the alarm is still there from time to time, but it doesn't cause any problem.
MN00431291 - I2C Sata Alarm since install
REPORTED IN SW LOAD - 10.2.2.15
SYMPTOMS
Site is getting SATA I2C cable alarm even after replacing I2C cable and RAID card
WORKAROUND = This problem was patched in 10.2.2.29 software.