Bomag BW177 D-5 Not viberating

Have a 2016 Bomag BW D-5 single drum vibratory roller serial number 1011589031358 that stopped vibrating. Machine was operating as normal till turned off vibration at end of reverse pass and upon going forward vibration did not start when button pushed. Machine runs fine both forward and reverse high and low speed just will not vibrate. I checked all fuses, good. changed relays around no change. Checked power at on/off frequency switch. Test light had a dim glow. I don't have any manuals for machine. Any help to solve problem is greatly appreciated. Where can I locate a service manual for the machine. Thank you, Steve