Index: firmware/App/Services/FPGA.c
===================================================================
diff -u -r494fa9614f7ec4cb0f677763c499044336ea8214 -r47eb930c3f010b7933ddf1b5d2d9f1a95be90c58
--- firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision 494fa9614f7ec4cb0f677763c499044336ea8214)
+++ firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision 47eb930c3f010b7933ddf1b5d2d9f1a95be90c58)
@@ -1532,7 +1532,7 @@
  *************************************************************************/
 void setFPGABloodLeakZero( void )
 {
-    fpgaActuatorSetPoints.fpgaSensorTest = FPGA_BLOOD_LEAK_ZERO_CMD;
+    fpgaActuatorSetPoints.fpgaSensorTest |= FPGA_BLOOD_LEAK_ZERO_CMD;
 }
 
 /*********************************************************************//**
@@ -1545,7 +1545,7 @@
  *************************************************************************/
 void clearFPGABloodLeakZero( void )
 {
-    fpgaActuatorSetPoints.fpgaSensorTest = 0x00;
+    fpgaActuatorSetPoints.fpgaSensorTest &= ~FPGA_BLOOD_LEAK_ZERO_CMD;
 }
 
 /*********************************************************************//**
@@ -1558,7 +1558,7 @@
  *************************************************************************/
 void setFPGABloodLeakSelfTest( void )
 {
-    fpgaActuatorSetPoints.fpgaSensorTest = FPGA_BLOOD_LEAK_SELF_TEST_CMD;
+    fpgaActuatorSetPoints.fpgaSensorTest |= FPGA_BLOOD_LEAK_SELF_TEST_CMD;
 }
 
 /*********************************************************************//**
@@ -1571,7 +1571,7 @@
  *************************************************************************/
 void clearFPGABloodLeakSelfTest( void )
 {
-    fpgaActuatorSetPoints.fpgaSensorTest = 0x00;
+    fpgaActuatorSetPoints.fpgaSensorTest &= ~FPGA_BLOOD_LEAK_SELF_TEST_CMD;
 }
 
 /*********************************************************************//**