diff --git a/.env.development b/.env.development
index 6df49cb..b8df4be 100644
--- a/.env.development
+++ b/.env.development
@@ -6,6 +6,6 @@ NEXT_PUBLIC_USE_MOCK_BACKEND_LOOP_START=false
 NEXT_PUBLIC_EXPORT_STATIC=false
 NEXT_PUBLIC_USE_CGI=false
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.550
+NEXT_PUBLIC_APP_VERSION=1.6.551
 NEXT_PUBLIC_CPL_MODE=json   # json (Entwicklungsumgebung) oder jsSimulatedProd (CPL ->CGI-Interface-Simulator) oder production (CPL-> CGI-Interface Platzhalter)
 
diff --git a/.env.production b/.env.production
index ed28cad..10e2a0b 100644
--- a/.env.production
+++ b/.env.production
@@ -5,5 +5,5 @@ NEXT_PUBLIC_CPL_API_PATH=/CPL
 NEXT_PUBLIC_EXPORT_STATIC=true
 NEXT_PUBLIC_USE_CGI=true
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.550
+NEXT_PUBLIC_APP_VERSION=1.6.551
 NEXT_PUBLIC_CPL_MODE=production
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbfa5af..eac4313 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## [1.6.551] – 2025-07-07
+
+- fix: TDR select List mouseover gray 200
+
+---
 ## [1.6.550] – 2025-07-07
 
 - fix: List mouseover -> hover:bg-gray-200
diff --git a/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx b/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx
index cd78cce..d136f3f 100644
--- a/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx
+++ b/components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChartActionBar.tsx
@@ -30,13 +30,6 @@ const TDRChartActionBar: React.FC = () => {
   const [selectedId, setSelectedId] = useState<number | null>(null);
   const currentChartData = selectedId !== null ? tdrDataById[selectedId] : [];
 
-  // 🔄 Dropdown-Auswahl: neue Messung laden
-  const handleSelectChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
-    const id = parseInt(e.target.value);
-    setSelectedId(id);
-    dispatch(getTDRChartDataByIdThunk(id));
-  };
-
   // 📌 Referenz setzen (nutzt Slotnummer + 1 für die API)
   const handleSetReference = async () => {
     if (
diff --git a/package-lock.json b/package-lock.json
index a17e9aa..80391c3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.550",
+  "version": "1.6.551",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cpl-v4",
-      "version": "1.6.550",
+      "version": "1.6.551",
       "dependencies": {
         "@fontsource/roboto": "^5.1.0",
         "@headlessui/react": "^2.2.4",
diff --git a/package.json b/package.json
index 70c1cb0..2df51e3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.550",
+  "version": "1.6.551",
   "private": true,
   "scripts": {
     "dev": "next dev",