In case of revision, the audit report should be given in the manner suggested by the Institute in SA-560 (Revised) “Subsequent Events”. It may be pointed out that report under section 44AB should not normally be revised. However, sometimes a member may be required to revise his tax audit report on grounds such as: (i) revision of accounts of a company after its adoption in annual general meeting. (ii) change of law e.g., retrospective amendment. (iii) change in interpretation, e.g. CBDT’s circular, judgments, etc. (iv)Any other reason like system/software error requiring change in report already uploaded. In case, where a member is called upon to report on the revised accounts, then he must mention in the revised report that the said report is a revised report and a reference should be made to the earlier report also. In the revised report, reasons for revising the report should also be mentioned.
The e-filing portal allows uploading such Revised Audit Report by the CA for the same PAN and Assessment Year.
If above issued not covered in your case. Not preferable to revise the audit report in your case because In the report you are certifying that " I have verified the books of accounts". So you will by in default when you file the revised tax audit report.