3 lengthwise cracks in the stiffener.
6 MM pin bushings are oval.
6 MM pin is corroded.
Older PDF with pictures:
Current FSB for door spring damage:
FSA_Door_Counterbalance704536-1
Service Bulletin F900ex-366 provides a better motor:
F900-413
F900-444
F900-459
Aman.Sharma@falconjet.com worked with me on the F900ex028 spring.