Body Equipment March 2015 Technical Service. This Service Information bulletin supersedes SI B51 11 12 dated March 2012. designates changes to this revision SUBJECT Engine Hood Does Not Open Properly. The engine hood cannot be opened or it is only unlocking on one side. Note: The hood can be opened if the hood release lever is activated by one person while another person pulls upward on the hood at the same time. CAUSE Incorrect adjustment of the hood strikers.