Start here: a leaking shower can be caused by failed silicone, failed grout, cracked tile, movement, poor drainage, screen issues, or waterproofing problems. Caulking can help when the visible joint has failed, but it is not a cure for every leak.
When silicone is the likely issue
Silicone may be the issue when it is split, loose, mouldy through the bead, missing from corners, or pulling away from the shower screen, tile, bath, or base. In that case, a proper strip-out and re-seal may be the right first step.
When it may be more than silicone
If there are swollen walls, staining below the bathroom, cracked tiles, loose grout, movement in the shower base, or water appearing away from the visible joint, the problem may need broader investigation. A fresh bead cannot fix failed waterproofing behind the surface.
The first checks before selling a re-seal
Brandon would look at the visible joint condition, where the water is showing up, whether the old silicone is bonded, and whether the failure appears local or widespread. If the job is outside a caulking scope, he will say that rather than sell a patch that is unlikely to solve the problem.
What photos help
Send close photos of the shower corners, screen edges, bath or base junctions, and any mould or gaps. Also send a wider photo and a note explaining where the water appears. If there is staining below or beside the bathroom, include that too.
The goal is a straight answer. If a re-seal is enough, Brandon can quote it. If the leak looks like it needs another trade or a site look first, that should be clear before money is spent on the wrong fix.