Index: leahi_dialin/dd/modules/records.py
===================================================================
diff -u -r5d919ffa14be669314a6a1c233ea820e7302a44a -re3abbf537274789164f2b5cdf7bded82d3533e8f
--- leahi_dialin/dd/modules/records.py	(.../records.py)	(revision 5d919ffa14be669314a6a1c233ea820e7302a44a)
+++ leahi_dialin/dd/modules/records.py	(.../records.py)	(revision e3abbf537274789164f2b5cdf7bded82d3533e8f)
@@ -377,8 +377,8 @@
 
 
     def cmd_set_system_records(self,
-                               part_number: chr[10],
-                               serial_number: chr[20],
+                               part_number: str,
+                               serial_number: str,
                                manufacturing_location: int,
                                manufacturing_date: int) -> int:
         """
@@ -420,6 +420,47 @@
             can_interface = self.can_interface)
 
 
+    def cmd_set_service_records(self,
+                                service_loc: int,
+                                last_service_date: int,
+                                service_interval_sec: int,
+                                last_reset_time: int) -> int:
+        """
+        Constructs and sends a command for setting the Service Records.
+        Constraints:
+            Must be logged into DD.
+            Must be in Service mode.
+
+        @return: 1 if successful, zero otherwise
+        """       
+        payload_count = 0
+        for e in dd_enum_repository.ServiceRecordFields:
+            if e != dd_enum_repository.ServiceRecordFields.NUM_OF_SERVICE_RECORD_FIELDS:
+                payload_count += e.datatype().size() * e.multichar_length()
+        payload_base = integer_to_bytearray(1)                      # Current Page
+        payload_base += integer_to_bytearray(1)                     # All Page Count
+        payload_base += integer_to_bytearray(payload_count)         # Payload count in bytes
+        
+        payload = b''
+        payload += byte_to_bytearray(service_loc)
+        payload += integer_to_bytearray(last_service_date)
+        payload += integer_to_bytearray(service_interval_sec)
+        payload += integer_to_bytearray(last_reset_time)
+        crc = crc16_modbus(payload)
+        payload += integer_to_bytearray(crc)
+        total_payload = payload_base + payload
+
+        return cmd_generic_override(
+            payload = total_payload,
+            reset = None,
+            channel_id = CanChannels.dialin_to_dd_ch_id,
+            msg_id = MsgIds.MSG_ID_DD_NVM_SET_SERVICE_RECORD,
+            entity_name = f'New DD Service Record',
+            override_text = 'being set',
+            logger = self.logger,
+            can_interface = self.can_interface)
+
+
     def cmd_set_calibration_records(self, calibration_records: dict) -> int:
         """
         Constructs and sends a command for setting the Calibration Records.