Please could you help me...my car used to run at about 14 psi of boost, a couple of weeks ago when boosting hard it developed a problem with loosing boost. This problem carried on for a few days but now my car will only boost up to 7 psi. Any ideas??

 

Could be running in limp home mode, although I'm not sure what exact boost pressure you would get if this was the case. Also if your boost solenoid was inoperative you would only generate around 9psi. Had the same problem the other weak when trying to insall an EBC. Also have you checked all hoses for cracks, splits etc.
Andy.