In the meantime it's no longer necessary to need some tools to unplug the drains.
Just lay beside your car and put your arm through the 4-corner-hole in the underbody right in front of the rear wheel.
Feel the rubber and pull it out with the plastic-ring.
In Germany we have many broken soft-top-engines and we created this support-site (in German):
http://www.zwiki.net/index.php/Hydraulikpumpe_defekt
best regards,
Frank