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If the system is the same as the 41 - then there might be two threaded rods just before the cable tension pulleys. You can remove the cable slack by adjusting the nuts to tension the cables.
New cables may stretch as you apply pressure - once they are stretched you may find the adjustments to be more responsive.
After re-reading your post, I am assuming that the brakes are functioning and the problem is isolated to the parking brake lever and cable system. The brakes, return springs, etc function fine?
