Index: SDDs/Power_Control.png
===================================================================
diff -u -r631dac140450713da60cf5bb938768382fbe2c44 -r27d80f36e863ae58963420607cf6e23c0318ccb1
Binary files differ
Index: SDDs/Power_Control.puml
===================================================================
diff -u -r631dac140450713da60cf5bb938768382fbe2c44 -r27d80f36e863ae58963420607cf6e23c0318ccb1
--- SDDs/Power_Control.puml	(.../Power_Control.puml)	(revision 631dac140450713da60cf5bb938768382fbe2c44)
+++ SDDs/Power_Control.puml	(.../Power_Control.puml)	(revision 27d80f36e863ae58963420607cf6e23c0318ccb1)
@@ -27,20 +27,49 @@
 
     == Power Off Sequence ==
     US -> TD: TCH: Press Hard Button - Power
-    TD -> SW: MSG: [xB7: #1] Power Off Request  \
-                \n\t(U32)  mStatus             
+    TD -> SW: MSG: [xB5: #3] Confirm Request                                \
+                \n\t(U32)  mId=0 (Shutdown)                                 \
+                \n\t(U32)  mCommand=0 (GENERIC_CONFIRM_CMD_REQUEST_OPEN)    \
+                \n\t(U32)  mReason
     SW -> UI: ACT: Power Off Request
     UI -> US: ACT: Display Confirm shutdown dialog
     US -> UI: TCH: Press Shutdown or Cancel
-
-    alt shutdown
     UI -> SW: ACT: Shutdown confirm response
     SW -> TD: MSG: [xB6: #2]  Response      \
-                \n\t(U32) mId=0             \
-                \n\t(U32) mConfirm=1          
-    TD -> TD: ACT: Shutdown System
-    else #Pink cancel
+                \n\t(U32) mId=0 (Shutdown)  \
+                \n\t(U32) mConfirm=0(cancel)/1 (shutdown)     
+
+    alt mConfirm=1 (shutdown)  
+        TD -> TD: ACT: Shutdown System ⟲ (May take a few seconds)
+        TD -> SW: MSG: [x22: #0] Power Off Warning             
+        SW -> UI: ACT: Power Off Warning
+        UI -> US: ACT: Display auto-close dialog (5 seconds)\
+                    \n\tNotiy user system is shutting down
+    else #Pink mConfirm=0(cancel)
+        TD -> SW: MSG: [xB5: #3] Confirm Request                                \
+                \n\t(U32)  mId=0 (Shutdown)                                 \
+                \n\t(U32)  mCommand=0 (GENERIC_CONFIRM_CMD_ACCEPT_CLOSE)    \
+                \n\t(U32)  mReason
+        SW -> UI: ACT: Confirm Request close dialog
         UI -> US: ACT: Close Dialog
     end
 
+    == Power Off Sequence Timeout ==
+    US -> TD: TCH: Press Hard Button - Power
+    TD -> SW: MSG: [xB5: #3] Confirm Request                                \
+                \n\t(U32)  mId=0 (Shutdown)                                 \
+                \n\t(U32)  mCommand=0 (GENERIC_CONFIRM_CMD_REQUEST_OPEN)    \
+                \n\t(U32)  mReason
+    SW -> UI: ACT: Power Off Request
+    UI -> US: ACT: Display Confirm shutdown dialog
+    ... Time passes ...
+    loop Timeout
+        US -> US: ACT: User idle for timeout limit 
+    end
+    TD -> SW: MSG: [xB5: #3] Confirm Request                                \
+                \n\t(U32)  mId=0 (Shutdown)                                 \
+                \n\t(U32)  mCommand=1 (GENERIC_CONFIRM_CMD_TIMEOUT_CLOSE)    \
+                \n\t(U32)  mReason
+    SW -> UI: ACT: Confirm Request timeout close
+    UI -> US: ACT: Close Dialog
 @enduml