Where the heatsink is soldered to the board, make sure it is an open circuit with the DMM , also make sure that the ground trace is an open circuit to the regulator output.
Edit: better explaination on power rails: put your DMM pos lead on the TB+ the neg on grd and it should not beap as a short (less than 10 ohms), do the same with TL+. My first SOHA I board had a tiny trace of the ground plane connecting TL+ with the ground plain causing it to blow fuses.
I found a short on the output (right) leg of the H- regulator. Is that wrong?