The fire trucks were there because of the over weight landing only. It is a standard proceedure.There was no problem with the aircraft. The fire crews followed the aircraft to stand because the brakes would have been very hot. Normaly the aircraft would wait out on the taxi way to let them cool off a bit but they were trying to get the poor little mite to hospital ASAP.
The reverser had nothing to do with it. That was just one of those “Murphy’s law” things. My spy tells me that the reverser was restowed, tested and found to be OK

Rgds Cking