SAS program improvement

I have a SAS code (with all the datasets, etc. available) that uses IML. I solve for simultaneous equations and use integral inside the code. The problem is that there is a bug in the code that does not let the code run and produce the results. The final output should contain improved SAS code (that should work and reproduce all the results), final output - all the newly created dataset. I will provide you all the dataset together with the sas code and the paper that it replicates.