Step 2 · Gain Access to Underside Plumbing
Locate and open the access panel on the tub surround. This may be a simple friction-fit panel, or it could be secured with screws. Use a screwdriver if necessary. If the panel seems stuck, a small pry bar can be used, but be extremely gentle to avoid damaging the tile or acrylic. Once open, use your headlamp to get a good view of the faucet's underside, including the supply line connections and the mounting hardware holding the faucet in place.