send it in if it has warranty(good luck getting it fixed 4 free.I'm my times with cc they dont honor a warranty. they make you at fault. 2 escs that failed and 1 10 amp bec.. )no faith in warranty fixes.lol
sure it is it just takes some work.. a good iron.have you pulled on wires that go into motor?.maybe ever pull tabs out and re-crimp them.some times this hobby requires making new skills
try a new sensor wire . I have had them fail .. or if you have a vom . test the conductivity of each contact, I've had a nib esc with included sensor wire be bad..