Hello Rob Sorry about the wait but working long hours,firstly tried your hold the loco button to no avail, so took my courage in both hands and went in ,devil of a job with those triangular screws,finally got it apart looked around but could not see any zebra connectors,anyway I thought I would boot it up and guess what, it's working! Tried it a dozen times every time a winner. Have not put it back together yet going to wait a couple of days because of those pesky screws. So much for "display buffer".Thank you Rob for your knowledge and time, any more problems and I will be seeking you out. Steve