Which customer feedback-driven modification dramatically improved the Hubble Space Telescope's functionality during its first servicing mission in 1993?

The Hubble Space Telescope represents one of astronomy's most significant customer-focused product developments. Initially launched with a serious flaw, NASA transformed potential disaster into a customer service triumph through its servicing missions. This poll explores how this iconic astronomical instrument changed the relationship between scientific products and their users, creating a new model for customer experience in high-stakes scientific instrumentation.

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COSTAR (Corrective Optics Space Telescope Axial Replacement) to fix the flawed primary mirror
Enhanced radiation shielding based on astronomer complaints about cosmic ray interference
Upgraded power supply system after customer reports of image transmission interruptions
New spectral analysis software following researcher feedback about wavelength limitations