In turtle mode the forward/reverse left/right function for the tracks work but the boom lift/lower tilt/curl will not function The error code is 5511 ( boom raise/lower implausible state) This code gets replaced by error code 5501 (boom raise/lower open circuit) In rabbit mode these error codes do not appear and the machine moves and lifts as expected. The loader has 850 hours The 1000 page repair manual I purchased does not show where this sensor is, it only has the same information about the error code as the operators manual. Any ideas as to the location of the cause and its repair would be appreciated