Perhaps you have some object dumping tools, or you can look for correlating data in the .MAP or .LST files.
>>Module "main.rel" was compile without errors/warning.
You understand that means Very Little, simply that the code appears syntactically correct, not that it is functionally correct, or sufficient to get closure in the linker.
Perhaps use bi-section techniques to isolate the portion of code involved, or the delta from the last code that compiled and linked properly.
