The manufacturer of popular namebrands such as Proform, Nordictrack, Healthrider, Epic, Gold's Gym (and others), Icon Health and Fitness, recently reengineered many of the popular motor controllers used in past and present treadmills, included is a picture is the replacement board for 263165 or MC2100LTS-30 shich is now 398056 MC1618DLS. Included in the box is 1) DETAILED instructions 2) adapter cable 3) Controller circuit board assembly.
Here's a list of known changes to other popular boards, see below:
319019 is now part number 399615
263076 is now part number 398055
319019 is now part number 399615
263149 is now part number 399604
274465 & 274467 is now part 399606
268949 is now part number 399605
266333 is now part number 398057
263165 is now part number 398056
313841 is now part number 399611
301881 is now part number 398063
313711 is now part number 399609