I have assembled the Pi shield according to the manual but when testing points C and D for 5 volts, I can’t get more than 4.3 volts at maximum increase on the voltage regulator potentiometer. The 5 volt pads (A) were joined with solder but I did not scratch the connection at (B). Can anyone suggest where I might have gone wrong, possibly with assembly ? I see there is one other similiar post on Feb 3rd. Any help appreciated. Regards from Canada. Dan Salmon