Hi, I gave my late 2013 15 rMBP in for the bottom half replacement for the creaking. Today I went to collect and they have only replaced the bottom plate and no other bits. But this isn't the problem. I booted it up and the flashing folder came up. She rudely took it to the back without telling me what was happening. After coming out she requested the firmware password as she said the SSD may have something wrong with it. I have since rang apple care and the advisor has mentioned that they have noted something on the heat sink is not reattaching; with their advice being a logic board replacement at the next service opportunity. I just feel something is wrong. Why do they need the firmware password? I saw the genius run a diagnostic without it when I dropped it off. I have already given them my password so I'm not concerned about data. I just feel I'm not getting the truth.