A good way to test the pin allocations is with the gpio utility and a script to toggle the GPIO pin periodically, then search for the pin with a digital multimeter or oscilloscope probe. I toggled the pins with the following single line in the shell (example for GPIO 5):

while true; do gpio enable 5; sleep 1; gpio disable 5; sleep 1; doneI then used my multimeter to detect the pin toggling between 0V and 3.3V every second. I seriously recommend that you do this to verify which pins you are working on prior to doing any soldering.