Agree with @PhilipDAth and @WadeAlsup that if replacing the MX60 with an MX64 and all is well now, and perhaps you were loooking to re-deploy the MX60 elsewhere, if the appliance will still boot and come online, place it in a test network and open a Support ticket for them to take an in-depth look at its health/status. If it won't even boot, or is otherwise in need of an RMA, it's covered by the lifetime warranty.