Wurlitzer 1800 Selecting Problems

When selecting the pushbuttons. I can select the letter and push the reset button and the letter button will pop out. This is same as the # button. But if I push one and then push the other nothing happens. The machine will not cycle for selection but makes a noise like something is not pulled in all the way. I know the problem is not in the bottom selector system, because I have changed it out with a spare and it still having problems.

Also have a problem with the credit unit. Sometimes the credit unit will not pull in the latch sol. Any help would be appreiciated.

thanks
Jukeman1972