XTRADB Cluster root password lost - Reset/change root password


I have a big problem.
I have crash my PC, so i lost the ROOT password to acces on Perconna Xtradbcluster Databases.
I have ROOT access on my 3 linux Centos servers.

How can i change the password without crashing all databases ?

Many thanks !

Version :
mysql Ver 14.14 Distrib 5.5.41-37.0, for Linux (x86_64) using readline 5.1

SUCCESS! MySQL (Percona XtraDB Cluster) running (7092)