Tables :: Update Table Value With SQL

I am trying to update a record value in a table with a user supplied value.A user logs a test against a serial number (there are multiple tests per serial so the tests are numbered) and logs how many repetitions will be performed in that test. If a failure occurs and they have to abort the test, I want to change the number of repetitions from what was supposed to run, to what was actually run. So the user enters how many tests were actually run and the code is supposed to find the matching serial number and test number in my Test Runs table and replace the Run Scripts value with the user supplied update.

My code runs without error but the record doesn't update. I've changed my table value types from numbers to text without result, I'm thinking there might be a problem with quotation marks? So it's searching for serial "123-321" instead of 123-321?

My code is below:

serial = Forms("Enter Run Failure").Controls("Serial")
runNum = Forms("Enter Run Failure").Controls("Run Number")
abortNum = Forms("Enter Run Failure").Controls("txtAbort")
Dim SQL As String

[code]....