I have a 1991 F150 Custom with the 5.0, 2wd, auto trans. My check engine light came on. I flashed the codes, key on, engine off and got 11 and 15. I flashed with engine on and got 33 and 77. Does the code 15 indicate the PCM needs to be replaced? Any help would be greatly appreciated. I gave the codes via video to a mechanic and he said it was the AIC. I cleaned it, still same codes.

Thanks in advance.