Hi. Thanks for using JA! I will try and help you out.
287.5 is an open circuit on the #3 Intake Valve Actuator. 287-7 is an Intake Valve Actuator Valve Not Responding code.
The most likely cause of these codes is a failed Intake Valve Actuator Solenoid. I see this alot.
It will not hurt your engine to run it until you find a dealer, the Intake Valve Actuator system will not be operating with these codes and you may not have full power.
Please let me know if you have more questions or need more help.