I didn't have a heat gun so I disabled the fan and left the 360 on for 1/2 hour to heat up the weak solder points and then let it cool down for 1/2 hour before re-assembling the 360. This gave me all green lights.

During your checkout of your hard work, make sure in System Preferences that the (use all F1, F2 etc. keys as standard function keys) box is unchecked.