2014 M/book Air is not starting up normally

Hello, my mac book air is running Yosemite. My first repair came recently with replacing the Logic Board on 10/27/14. About 2 weeks later my start up would go halfway and stop requiring a restart. The next start up would complete ok. On 11/29/14, my 1st diagnostic test revealed error code 4MEM/62/400000000:07a719f90 (unknown code). On 11/30/14, the Apple G/Bar suggested to check FireVault. Attempt was made to turn off F/Vault while with at the G/Bar and an error appeared not allowing a turn off. G/Bar assumed the problem was identified, but the operating sys had to be uninstalled / reinstalled to turn off FireVault. All seemed well until today 12/01/14, my start went halfway again and stopped. A 2nd diagnostic test revealed 4MEM/62/40000000:0x795d7b90. I just made another G/Bar appt.
Anyone experience similar problems, or do you have answers to my problem? Thanks in advance.

Taking  the computer to the Apple store is the best thing to do.
Best.

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