This just in from the Road Commission of Oakland County . . .   Canadian National (CN) will perform railroad crossing repairs at the Joslyn and Brown Road intersection in the communities of Auburn Hills and Orion Township on Thursday, June 30 beginning at 9 a.m.    During the repair, one lane of traffic will remain open in each direction. Flaggers will also be directing traffic.     The repair work should last one day and CN plans to have all lanes open to traffic around 4 p.m. on June 30.    Motorists can expect some delays.