I occasionally check with https://tools.geofabrik.de/osmi/?view=pubtrans_routes&lon=146.08876&lat=-37.13979&zoom=9&baselayer=Geofabrik%20Standard&overlays=ptv2_routes_valid%2Cptv2_routes_invalid%2Cptv2_error_ways%2Cptv2_error_nodes%2Cptv2_routes_valid%2Cptv2_routes_invalid%2Cptv2_error_ways%2Cptv2_error_nodes

I mainly check the long distance routes eg Syd to Perth