The recent rains have exposed the weaknesses in our roofs and drainage. Water issues abound resulting from the decade high rainfall that occurred in mid February. Experts are quick to recommend a solution: new roofs, roof sections, gutters, swails, waterproofing, french drains, etc. From my experience, I would first use a hose ,if possible, to identify the cause of the leak. You may need to expose the structure under the drywall to accomplish this task. Once the remediation is complete, I would again use a hose to test the success of the remediation. For more complex jobs, you can hire a water leak testing company.