Depends. As you remove the pressurisation from the incoming side then, if it's borderline on the pressure side, it may sit back down and seal. You could only tell that if you had pressure gauges all over the show.
Did you reset the bubble? How long did that take?
Not long as the customer had done it themselves twice before I got there trying to sort the issue themselves. They said it's been runni g constantly for about 2weeks.