The MySRLab scenarios have been discontinued (with the exception of QoS).
You can still prepare for your SRC SRA Lab exams by scheduling a SRC-Course lab in MyNetworkLab and practice using any of the SRC related courseware lab guides.
For more information regarding the MySRLab service, please vist https://www.nokia.com/networks/training/src/mysrlab/
For NRS I and NRS II level courses, you can practice using the new Nokia Learning Labs