The first thing to determine is if you have separate keytabs and accounts for each system that is configured for the one way trust.
This is important as it determines how to move forward to resolve.
If you have keytabs all sharing a single account in AD do not run the following password reset command as it will break all of your other cross domain one way trust systems.
If each keytab has it's own account (recommended) then run the following is an example of what to run to recreate and sync the password.
/opt/quest/bin/vastool -u email@example.com passwd -rk /etc/opt/quest/vas/vasoneway.keytab firstname.lastname@example.org
In the above example after the -u is an is admin account with permissions to set an account in the cross domain, the keytab and then the samaccountname of the account being set in AD @ cross domain.
If all your systems share one account try saving off and moving over a keytab from a working system to resolve.