Help with Transformer

Well all I Can say to you is when I tested this originally I had the 12 volt bulb connected to the track posts On transformer and indeed when I depressed the direction, whistle and bell buttons the light lit up....now it does not.....

 So the test light goes out when you press direction. It should. Removing power cyles an eunit thru fwd/N/rev unless the eunit sw. is off/lock.

The whistle/bell; was the throttle up? You shouldn't see power just by that button alone. With power on the rails and a test bulb on track, the bulb should stay lit during a whistle/bell. Proper test needs a whistle board or whistle relay or a voltmeter on dc to look for a dc offset of a couple of volts when whistling

Sounds like the CW-80 is working correctly, but was not working correctly before you opened it.

Our hobby transformers are intended to work in this manner: 
The direction button is a NC (normally closed) switch. It interrupts power to the track. No electricity should flow with it depressed since the circuit is open.
The whistle and bell button will add a DC offset to the track and should not work independently of the throttle i.e. with the throttle "off" no DC voltage should be sent to the track; with the throttle "on" the whistle or bell (if equipped) should be activated by the DC offset when the appropriate button is depressed.

Thanks for your input....I’ll put my train on the track tomorrow and test it that way....it should work with current fed into track....

Yea , I skipped having throttle up for direction too. Its so lifelong ingrained in me I missed it, sorry.  

To teach well, one assumes a student knows nothing at all. (Plato, loosly)