Index: SDDs/Service.puml
===================================================================
diff -u -r66bd45c35e31d6afc23cf062d8016260b327e623 -rb0c71a211c89d3783233dcbe631ecbf26796db6f
--- SDDs/Service.puml	(.../Service.puml)	(revision 66bd45c35e31d6afc23cf062d8016260b327e623)
+++ SDDs/Service.puml	(.../Service.puml)	(revision b0c71a211c89d3783233dcbe631ecbf26796db6f)
@@ -1,6 +1,7 @@
 @startuml Service
 
     participant OS                  as OS
+    participant FS                  as FS
     participant Script              as Script
     participant DD                  as DD
     participant TD                  as TD
@@ -33,6 +34,9 @@
     UI -> US: ACT: Manufactoring password screen
     US -> UI: ENT: Enter new password
     US -> UI: TCH: Confirm New password
+    UI -> SW: ACT: Check password satisfies password requirements \
+                \n\t Hash password
+    SW -> FS: ACT: Write password hash in System.conf
     US -> UI: TCH: Shutdown
 
     == Service Log In ==
@@ -42,7 +46,10 @@
     UI -> US: ACT: Service Password Screen
     US -> UI: ENT: Enter Service Password
     US -> UI: TCH: Press Confirm
-    UI -> SW: ACT: Check if matches hashed password \
+    UI -> SW: ACT: Retrieve password from file system
+    SW -> FS: ACT: Retrieve password hash
+    FS -> SW: ACT: Read password hash from System.conf
+    SW -> SW: ACT: Check if matches hashed password \
                     \n\t-vSettings.isServicePasswordM
     alt Accepted
         SW -> UI: ACT: Notify UI password is correct
@@ -167,8 +174,8 @@
     UI -> US: ACT: User Modes Screen
     US -> UI: TCH: Touch professional mode switch
     UI -> SW: ACT: Set professional mode on or off
-    SW -> OS: ACT: Write configuration in System.conf
-    OS -> SW: ACT: Read configuration from System.conf
+    SW -> FS: ACT: Write configuration in System.conf
+    FS -> SW: ACT: Read configuration from System.conf
     SW -> UI: ACT: Notify UI
     UI -> UI: ACT: Update Sliding Switch
 @enduml