AEN: APORT_TIMEOUT_DETECTED (port=0)
The 3ware driver appears to log any critical error under event id #3 (error).
Even though the message "only" reports a timeout problem, it seems to indicate that the drive connected to port 0 has failed and needs to be replaced (as was the case here).
If the drive is in a fault tolerant RAID (e.g. RAID 1 or RAID 5), then the logical drive will continue to work, though with degraded performance.