Macbook pro wont start with 3 beeps

hi
Few months back I purchased a refurbished macbook pro (late 2012 model) with i7 processor and 8 GB ram. Now after 2 months I experienced problem with mac - it wont start with 3 beeps. I looked at different articles in net and found about no memory bank problem. I opened the back and changed slots and it seemed to fix the issue. However the issue was recurring few times and ram was changed. Again the issue seemed to have resurfaced. I tried with memtest in single user mode and RAM passes the tests.
What else could be the issue around the macbook pro. Do you suggest taking it to local Apple store to get it checked?
Thanks

Test each module installed alone while switching slots (power down before switching and remove battery.) Do both modules work alone in each slot? If they do, then it would appear the memory is good as are the slots. So, something else is at play and only an Apple Store has the equipment to go further - make a Genius Appointment and take it in for service.

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