Have an AR 505 that flashed an error code e7-11. I cleaned the optics, mirrors, and the exposure bulb etc. ran sim 5:3 and the bulb does light up. The code cleared for a bit and now it is back. I am wondering if the exposure bulb can light up, but not enough to get the correct white board read, but light up enough to not give the e7-13 error code? The book mentions the CCD unit & ICU PWB, as well as the flat cable leading to the CCD unit possibly causing the error code. I was just wondering if anyone else has had this problem and could shed some light on the situation, before I start messing with the CCD & PWB. Since the problem is intermittent, I will try the bulb first. Any suggestions are appreciated.