This excerpt from the user's manual can explain the problem of your spring.
"...Use of this copyright protection technology must be authorized by Rovi and is permitted for home and other limited viewing purposes unless otherwise authorized by Rovi. Please note that not all high-definition TVs are fully compatible with this product and there may be artifacts in the presentation of the image. IF ANY 525- OR 625-PROGRESSIVE SCAN IMAGE IS ERRONEOUS, IT IS RECOMMENDED THAT THE CONNECTION BE SET TO "STANDARD DEFINITION" OUTPUT...."
NEFF S52L68X1EU, NEFF GX 550, S52M53X4EU, NEFF S723P60X0E, FRANKE FDW-612 E6P A++, 117.0266.492, 1170266492, , NEFF GV 453, S51M53X6EU, NEFF S58E50X1EU, NEFF S72N65X5EU, NEFF S51E50X3GB, S51E50X3GB
Manufacturer's part price is £22.62 Discount for bulk (starting at 10 units), £21.87 per unit
This manufacturer part is recomended by NEFF, which gives it a 10/10 rating.
This spare part is recommended for your NEFF S51E50X3GB dish washer .
All spare parts are new and come with two years warranty
① Carefully check your NEFF dish washer's product number
② Start search
Here are examples for partial reference for dishwasher :
Where to find the reference?