To start services by respective WAS user (was61) edit script and add following option
sudo -u was61 -c “$WAS_HOME/dmgr/bin/startManager.sh”
sudo -u was61 -c $WAS_HOME/Node/bin/start_nodeagent.sh
sudo -u was61 -c $WAS_HOME/Node/bin/start_server_member1.sh
sudo -u was61 -c $WAS_HOME/Node/bin/start_server_member2.sh