Turn sw-1 on the receiver off to disable the computer from the control loop that moves the servos. At this point only the radio will move the servos, not the position (tilt) of the bird, just the transmitter. In this mode you can turn on TH to stop the motors. If your pitch curve in TH on mode goes from -100% on the left of the curve and +100% on the right, then moving the throttle stick should move the swash plate up and down. The swash should be level if you don't move the cyclic (right) stick at all. With the throttle (pitch) set to mid-point (50%) the swash will be in the center where there is zero pitch. Be SURE that all 3 servo arms are relatively horizontal. I'm guessing that you will notice that the arm on the "front servo" (ELE) is not horizontal like the other 2 servos. This is because when you replaced it, you have the servo arm installed incorrectly on the servo shaft. As you know the shaft and arm have groves in them to keep from slipping. These groves limit what angle you can put the arm at to a 'click' at a time. If you are a 'click' off in either direction because when you put the arm back on the new servo shaft you were off by a click, then pull the arm back off and get it as close to level as you can with the above setup. When this is done the swash should be level again. If not you may need to tweak the connecting rod length on it. My experience has been that if you just replace the servo and leave the existing arm in place with the linkage etc. then as long as you get the arm back on in the same 'click' point as the old one was, you should be level and ready to fly.
Don't forget to turn sw-1 back on using the switch on the receiver board. You won't be able to fly it without the computer helping with the servo movements!
Hope this helps.
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