Hi Dani,
It is a strong guess that they never switched of Flight Directors, otherwise you would hear a remark of the two operating pilots on the tape.
It's more than a strong guess - it's reported on page 74:
"The Flight Directors were not disengaged by the crew, but the crossbars disappeared."
If I was flying at 02:00 and with all the other noises and attention getters going off whilst keeping the wings level in ALT Law, I also may have forgotten to ask for the FDs to be turned off - simply because they had already disappeared from view.
They seem to have simply remembered their previous training (further down on P74)
"The two copilots had only been trained for the emergency manoeuvre at lower levels, in the course of which the pitch attitude to adopt is 10° or 15°."