read this:
"The description of this aerial battle from Saburō Sakai is different. He spotted eight planes in two flights of four and initially identified them as F4F Wildcat fighters. When he attacked - followed by three other Zero fighters, he discovered that the airplanes were TBF Avengers because he clearly distinguished the top turret and the ventral machine gun. He shot down in flames two of the TBF Avengers and these two victories (61st and 62nd) were verified by the other three Zero pilots but during this day, no TBF Avengers were reported lost. This is an example how even an experienced pilot during the heat of battle, may not identify correctly enemy airplanes or receive verified credit for airplanes not shot down.
Sakai sustained grievous injuries from the return fire; he was struck in the head by a 7.62 mm (0.3 in) bullet, blinding him in the right eye and paralyzing the left side of his body. The Zero rolled over and headed upside down toward the sea. Unable to see out of his remaining good eye due to blood flowing from the head wound, Sakai's vision started to clear somewhat as tears cleared the blood from his eyes and he was able to pull his plane out of the steep seaward dive. He considered crashing into one of the American warships: "If I must die, at least I could go out as a Samurai. My death would take several of the enemy with me. A ship. I needed a ship." Finally, the cold air blasting into the c**kpit revived him enough to check his instruments, and he decided that by using a lean fuel mixture he might be able to make it back to the airfield at Rabaul.
Although in agony from his injuries (he had a serious head wound from a bullet that had passed through his skull and the right side of his brain, leaving the entire left side of his body paralyzed, and was left blind in one eye,) Sakai managed to fly his damaged Zero in a four-hour, 47-minute flight over 560 nmi (1,040 km; 640 mi) back to his base on Rabaul, using familiar volcanic peaks as guides. When he attempted to land at the airfield he nearly crashed into a line of parked Zeros but, after circling four times, and with the fuel gauge reading empty, he put his Zero down on the runway on his second attempt. After landing, he insisted on making his mission report to his superior officer before collapsing. His squadron mate Hiroyoshi Nishizawa drove him, as quickly but as gently as possible, to the surgeon. Sakai was evacuated to Japan on 12 August, where he endured a long surgery without anesthesia. The surgery repaired some of the damage to his head, but was unable to restore full vision to his right eye. Nishizawa visited Sakai while he was recuperating in the Yokosuka hospital in Japan."
now, are you ready to "man up" and give it another shot?
try hardwiring the circuit on a breadboard or something, brute force, PC boards can be tricky, look for hairline shorts with a mag glass, sometimes when you bend the board a trace will open up, ohm out every trace, check circuit diagram again,
when you finally find it, your heart will soar like an eagle.