What service should we get to handle this issue?

[Sophia Wang]

We have a townhouse in FL currently rented out. Last weekend, the tenant sent me a few text messages for concern of mold in the house.

Back in January, we have had the downstairs half bath toilet clogged once, and some water overflew but not too bad. We had the pergo laminate wood floor in the adjacent living room. Water was removed quickly, and didn't cause any damage at the time.

Fast forward to last weekend. Tenant reported that the pergo floor next to the half bath started to 'bow' a bit, and it has been getting more obvious over the last few weeks. It is still not bad, but getting noticeable. ALSO, they noticed there are some spots (grey-light brownish) showing up on the downstairs AC vent covers. The spots are not there on the inside of the vent covers, nor anywhere on the upstairs vent covers. They are concerned if it may be mold, so reported to us.

Given the fact that it has been almost 10 months since the water overflow issue, I can't imagine the bowing of the floor and the spots on the vent cover are from the moisture back then. But have got no other leads. What would be the best service person we should get to take a look? A mold guy?