Fill Tube Heater Assembly (501F, 511, 532, 550,
          561, 245, 249FFI)
  501F    Prior to #M1184540/P1200040. Starting
          with #M1184540/P1200040 see 7014705.
  511     Prior to #M1184540/P1200040. Starting
          with #M1184540/P1200040 see 7014705.
  532     Prior to #M1184540/P1200040. Starting
          with #M1184540/P1200040 see 7014705.
  550     From #M681166 to #M681565 and from
          #M702716/P700765 to #M1184540/P1200040
          except between #M1182989-M1183389.
          Starting with #M1184540/P1200040 and
          between #M1182989-M1183389 see 7014705.
  561     Prior to #M1184540/P1200040. Starting
          with #M1184540/P1200040 see 7014705.
  245     Use Prior to Serial #M1191940.
          Starting With #M1191940 see 7014705.
  249FFI  Use Prior to Serial #M1191940.
          Starting With #1191940 see 7014705.