IMU Mismatch numbers explanation/Pixhawk Gyro Failure

I was wondering if anyone could tell me what the first mismatch number parameter means/significance? I have it highlighted in red.
NOWN - No ATUN log data
Test: Balance/Twist = GOOD -
Test: Brownout = FAIL - Truncated Log? Ends while armed at altitude 5.22m
Test: Compass = GOOD - mag_field interference within limits (7.94%)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = GOOD -
Test: GPS = GOOD -
Test: IMU Mismatch = FAIL - Check vibration or accelerometer calibration. (Mismatch: 1.97, WARN: 0.75, FAIL: 1.50)
Test: Parameters = GOOD -
Test: PM = GOOD -
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = GOOD -

I posted this on DIY drones forum and received this message from a user:

Artem: “need the whole log, but looks like your IMUs didn’t agree with each other. usually happensa either on 3DR pixhawks mad between 01jun14 and 01dec14. In this case RMA to 3DR.
This also happens with clone hawks due to incorrect power filtration to IMU2 lsm303d. In this case try to exchange it with your merchant.”

Is this a widely known issue on Pixhawks made in this time frame?

Any help would be greatly appreciated.

Here are the complete logs.

Here is the dlog.