Hey Albertofdz,
For this concerning procedure there is no other reason besides the faulty ADRs, as all other systems work normally (besides those effected by the faulty ADRs).
But other reasons for gravity extension could be Green HYD failure/leakage, LGCIU 1+2 failures, EMER ELEC config, locking sysem failures ect ect.
Hope this will help.
regards