The JCB 535-125 is a telescopic handler, also known as a telehandler, which is a type of equipment used for material handling and construction. Here's some general information about the machine:
Features a 4.4L JCB Dieselmax engine with power options ranging from 55kW (75HP) to 93kW (125HP). manual jcb 535-125.pdf
Error code "Eng 123" on the dash.