diff --git a/MuonSpectrometer/MuonAlignment/MuonAlignError/MuonAlignErrorTool/src/AlignmentErrorTool.cxx b/MuonSpectrometer/MuonAlignment/MuonAlignError/MuonAlignErrorTool/src/AlignmentErrorTool.cxx
index 851b0c882a2ce296dba948fab38df2cf5916a9ce..5fcd423b5cc5d4cd2dd23a9277b434fd04d90d42 100644
--- a/MuonSpectrometer/MuonAlignment/MuonAlignError/MuonAlignErrorTool/src/AlignmentErrorTool.cxx
+++ b/MuonSpectrometer/MuonAlignment/MuonAlignError/MuonAlignErrorTool/src/AlignmentErrorTool.cxx
@@ -81,7 +81,6 @@ void AlignmentErrorTool::makeAlignmentDeviations (const Trk::Track& track, std::
   const MuonAlignmentErrorData* readCdo{*readHandle};
   if(readCdo==nullptr){
     ATH_MSG_ERROR("Null pointer to the read conditions object");
-    std::cout<<"ckato Null pointer to the read conditions object"<<std::endl;
     return;
   }
   std::vector<deviationStr> devStrVec;
diff --git a/MuonSpectrometer/MuonCablings/MuonCablingData/MuonCablingData/MdtMapBase.h b/MuonSpectrometer/MuonCablings/MuonCablingData/MuonCablingData/MdtMapBase.h
index cce06952d5df5e6bd7053756bbee15354f42b2aa..cd68f71f97587c78c03f99e918cce501b8532923 100644
--- a/MuonSpectrometer/MuonCablings/MuonCablingData/MuonCablingData/MdtMapBase.h
+++ b/MuonSpectrometer/MuonCablings/MuonCablingData/MuonCablingData/MdtMapBase.h
@@ -196,7 +196,7 @@ template<class T> T* MdtMapBase<T>::findItem(uint8_t itemId) const{
   if (it!=m_mapOfItems->end()) {
     return (*it).second;
   } else {    
-    return NULL;
+    return nullptr;
   }
 }
 
diff --git a/MuonSpectrometer/MuonCablings/MuonMDT_Cabling/src/MdtTestCabling.cxx b/MuonSpectrometer/MuonCablings/MuonMDT_Cabling/src/MdtTestCabling.cxx
index f43b20b69ee3c05c2c2ed266669389627fefb131..6995ddad7275a0c02c8fecadb0d672e908595373 100644
--- a/MuonSpectrometer/MuonCablings/MuonMDT_Cabling/src/MdtTestCabling.cxx
+++ b/MuonSpectrometer/MuonCablings/MuonMDT_Cabling/src/MdtTestCabling.cxx
@@ -71,11 +71,11 @@ bool MdtTestCabling::testMap()
 
   // print the list of ROBids
   std::vector<uint32_t> robVector = readCdo->getAllROBId();
-  std::cout << "============================= List of ROBids:" << std::endl;
+  ATH_MSG_DEBUG( "============================= List of ROBids:" );
   for (unsigned int i=0 ; i<robVector.size() ; ++i) {
-    std::cout << std::hex << robVector[i] << std::dec << std::endl;
+    ATH_MSG_DEBUG( std::hex << robVector[i] << std::dec );
   }
-  std::cout << "=============================================" << std::endl;
+  ATH_MSG_DEBUG( "=============================================" );
 
   // loop on the hardware objects to get online identifiers