Computer boots up perfectly. When working for some time it freezes and start to make beeping sound for few times. Then switches off.
Apple Authorised Service Provider tested and concluded, that failure might be small micro cracks in motherboard which couldn't be fixed.
Computer have following upgrades:
1) Storage: Crucial MX300 1TB SSD
2) RAM: Crucial 2x8GB DDR3L-1333 SODIMM 1.35V CL9
3) Battery changed year ago. Not original.
Computer have hardware failure
Computer case has some scratches and bump on side (not reason of failure)
Screen has no scratches or cracks
Keyboard and touchpad is working perfectly
Ports are working perfectly
Charger has some duct tape on. Wire has been soldered once. Looks bad but works perfectly.
Missing 3x screws on back.