P4 Intermittent ESC 4 error

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Had slight crash last yr not major. Replaced landing gear, all motors(soldered),ESC board right #45(soldered), app deleted, set to factory default, firmware updated(v0200 0810).
Reassembled, got ESC 1,2,3,4. Disassembled found black wire from compass pinched cut in half. Replaced, reassembled, GoFly auto take off ok. calibrated controller, IMU, compass. NB:IMU only went to 2, did not state complete but it had over 15mins to run. P4 reported WiFi interference when doing compass. Checked all green etc GoFly auto take off ok.
Went to field, did compass calibrate GoFly auto take off P4 hovered then went left and crashed no sign of damage report ESC4,3.
Disassembled, all wiring, ribbons ok. Connected gimble, left bottom+landing gear to one side. Tested, no ESC errors. Reassembled but did not screw gimble to body just snap in(it had 2mm movement) tested no ESC errors GoFly, auto take off ok did several times. However when I squeezed the left side(battery at back) ESC4. power down restarted, GoFly, squeeze right ESC4.
So I got GoFly, as long as the gimble is not screwed in. Buzzar.
Ps can't see how a cut compass wire would make P4 report ESC error?
COMPASS
Compass1 in use 36-50
Compass2 not 38-56
All excellent
IMU
Acc1 in use
Acc2 not
Gyro1
Gyro2
All good to excellent

Hope our good friends in the USA are all keeping safe, best regards Andy UK
 

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Found solution after one year in storage over £100 lighter and god knows how many hours.
Not the motors
Not ESC Board
Not the wiring
Not s/w or h/w

It was a thin tin plate on the underside of the gimbal l, slightly bent, touching the main ESC board hence ESC4
See pic
 

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Is com2 or acc2 not in use, going to be a flight problem or readings normal?
Compass1 in use 36-50
Compass2 not 38-56
All excellent
IMU
Acc1 in use
Acc2 not
 

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