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diff --git a/Marlin/src/gcode/feature/caselight/M355.cpp b/Marlin/src/gcode/feature/caselight/M355.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../../inc/MarlinConfig.h"
+
+#if ENABLED(CASE_LIGHT_ENABLE)
+
+#include "../../../feature/caselight.h"
+#include "../../gcode.h"
+
+/**
+ * M355: Turn case light on/off and set brightness
+ *
+ *   P<byte>  Set case light brightness (PWM pin required - ignored otherwise)
+ *
+ *   S<bool>  Set case light on/off
+ *
+ *   When S turns on the light on a PWM pin then the current brightness level is used/restored
+ *
+ *   M355 P200 S0 turns off the light & sets the brightness level
+ *   M355 S1 turns on the light with a brightness of 200 (assuming a PWM pin)
+ */
+void GcodeSuite::M355() {
+  bool didset = false;
+  #if CASELIGHT_USES_BRIGHTNESS
+    if (parser.seenval('P')) {
+      didset = true;
+      caselight.brightness = parser.value_byte();
+    }
+  #endif
+  const bool sflag = parser.seenval('S');
+  if (sflag) {
+    didset = true;
+    caselight.on = parser.value_bool();
+  }
+  if (didset) caselight.update(sflag);
+
+  // Always report case light status
+  SERIAL_ECHO_START();
+  SERIAL_ECHOPGM("Case light: ");
+  if (!caselight.on)
+    SERIAL_ECHOLNPGM(STR_OFF);
+  else {
+    #if CASELIGHT_USES_BRIGHTNESS
+      if (PWM_PIN(CASE_LIGHT_PIN)) {
+        SERIAL_ECHOLN(int(caselight.brightness));
+        return;
+      }
+    #endif
+    SERIAL_ECHOLNPGM(STR_ON);
+  }
+}
+
+#endif // CASE_LIGHT_ENABLE