It looks like the left hand fan cowl on the left hand engine (so invisible to the pax/crew).
I don't think all undercowl fire extinguishing capabilities would be lost. Looking at the books on the CF6, there doesn't appear to be any fire detectors in that left hand fan cowl area, but there may be extinguishing nozzles (?).
Apart from nacelle anti ice ducting, I recall the engine EEC lives there.
The electrics would be reasonably waterproof. The EEC has ambient pressure (Po) ports, but, if the crew reported no problems, I guess the EEC wasn't bothered by a bit of fresh air
