diff --git a/update_psa b/update_psa
index d94e477..e646c0b 100755
--- a/update_psa
+++ b/update_psa
@@ -70,43 +70,9 @@ done
     
 source ./update_psa_impl
 
-if [ -z "$WORKING_DIRECTORY" ]; then
-    log_fatal "update_psa:${LINENO}: empty WORKING_DIRECTORY"
-fi
-
-if ! cd "$WORKING_DIRECTORY"; then
-    log_fatal "update_psa:${LINENO}: cannot cd to $WORKING_DIRECTORY"
-fi
-        
-log_info "update_psa:${LINENO}: cd to $WORKING_DIRECTORY"
-
 if read_config; then
-    check_default_route
-    check_route_to_repository "185.191.219.134" # git.mimbach.de
-    check_for_running_apism
-    if clone_customer_repository ${CUSTOMER_REPOSITORY_PATH}; then 
-        check_sanity_of_repository
-
-        if [ "$MAINTENANCE" = "NO" ]; then
-            log_info "update_psa:${LINENO}: MAINTENANCE OFF. Checking for updates..."
-            # someone must have activated the WAIT-button in ISMAS. 
-            # Request the status of this button in updates_available().
-            if ! updates_available; then 
-                update_psa_false_alarm "update requested, but no WAIT state detected !!!"
-                log_fatal "update_psa:${LINENO}: update requested, but no WAIT state detected !!!"
-            fi
-        else
-            # simulate an activated WAIT-button
-            set_updates_available
-            while :
-            do
-                sleep 5
-                updates_available && break
-            done 
-        fi
-        # updates available
-        update_psa
-    fi
+    update_psa
+    exit 0
 fi
-exit 0
+exit 1
 ###############################################################################