Just seconding what CSL has posted for McGill (this is the text from the link)
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Posted: 7/14/2016
Thank you for your continued interest in Sony® products.
Sony has found that a limited number of HAP-S1 and HAP-Z1ES Hi-Res Music Players may develop a white horizontal line across the LCD display.
Symptom
Over time, a white horizontal line may appear on the LCD display of some players due to component failure.
Affected Models
Some HAP-S1 and HAP-Z1ES Hi-Res Music Players within the following serial number ranges.
HAP-S1 with serial numbers from 8800001 to 8801965
HAP-Z1ES with serial numbers 8800001 to 8802760
Note: Not all players within the serial number ranges are affected.
How to Check Your Model and Serial Number
The model and serial number are listed on the label on the back of the player.
HAP-S1
HAP-Z1ES
Solution
Subject to the terms of the limited warranty that accompanied the product, Sony will provide free repair for affected units until July 31, 2018.
If your HAP-S1 or HAP-Z1ES is within the affected serial number range, and is experiencing this issue, please contact Sony Support at 877-643-1216 to arrange for service.
