Manny was unable to find the fault associated with my transmission which he thought was a an onboard computer problem which was causing the gears to change abruptly causing a dangerous jerking motion on my car but agreed to waive the diagnostic and service charge of $70 that I felt was unjustified I later found out from the Cadillac service department after an exaustive inspection that the gearbox assembly bar was dangerously loose and simply needed to be adjusted and tightened they also agreed not to charge me for the diagnostic checkup just the labor I felt compelled to write this positive review for the courtesy he extended me by dismissing his charges