Normally on drives with bad SA the spindle stops spinning.
You should be able to change the firmware zone aba to prevent firmware loading and then scan the drive for modules, find the dir, and attempt to read the other modules on the SA.

In any case i think you should outsource the drive to someone with more experience.

Maybe someone working on Brasil and reading this are willing to take this case ?

Insulate the head contacts so that the drive doesn't read SA from the platter when it starts.

Then it depends on the tool you have.

For WDR utility the option is on Actions - Region Map Edit and i've made a guide where i use that function to play with the DIR module :

http://www.hddoracle.com/viewtopic.php?f=86&t=1071



On PC-3000 the option is on the "Tests" "Service Information" "Work with Rom" "SA Regions Editor)





I don't have MRT here neither access to one right now, so i can't check it out for you, but check on the menus of the Marvell tool and you should find it there somewhere.