After the BHA has been pumped down to TD, the expectation is that all energetics are fired without issue. With that being said, occasionally an issue arises that prevents one (or multiple) guns from firing properly. If surface troubleshooting and electronic adjustments are made with no improvement, the BHA should be pulled out of hole to inspect.
After pulling the BHA, and disarming the guns, it should be inspected to find the cause of the issue. The BRT should be removed and the gun string should be checked with the surface verifier. If the gun string passes verification, the BRT should be torn down and inspected. In this case, after tearing down the BRT, it is apparent that the through wire in the module tube is broken at the solder joint. This solder joint in the module tube should be durable, but under certain circumstances it can break.
After the cause of the error is identified, the entire crew should be made aware of the issue and reminded to do a pull test on the wires in the BRT module tube to ensure all of the solder joints are secure. This should help prevent this issue from occurring in the future.