[BKKG]

The yellowing looks like a calcium deficiency to me, so getting a micronutrient solution could help with that.

How much of the nutes were you adding, and how often, and at what concentration?

I wouldn't use the wood chips for the following reasons:
1. They'll mess with your drainage, because they'll absorb water and with all the soil on top they won't be able to evaporate it. This will make the moisture level in your soil harder to determine and maintain.
2. They came from outside, and a public outside place at that! You should never bring something from outside into contact with your indoor plants, because you don't know what kind of parasites you might have dragged in with them.

The drooping of the leaves looks like plain old overwatering to me, although if you haven't watered in 4 days I can't be as confident in that as I would normally be.

I would recommend waiting another day or so to see if the leaves perk up at all, and if they still haven't I would transplant to fresh soil but NOT potting soil (that's got nutrients in it and has screwed up a lot of plants in the past.). If you transplant, move into soil without woodchips and try a flush of the rootball. The plant does look fairly stressed, but since it's not doing well at the moment you may not have a whole lot to lose.