The first link in the other comment doesn't work anymore (as expected), so here it is from the Wayback Machine. https://web.archive.org/web/20210127043510/https://h10032.www1.hp.com/ctg/Manual/c06172090
If you're coming here from a search engine and want to find the service manual for your specific laptop, I found my own variant (again, apparently) by searching for:
[quote|format=featured]HP 15-eh "Maintenance and Service Guide"[/quote]
for a [[Topic:HP Pavilion 15-eh|15-eh0018na|new_window=true]] (opens in a new tab). This highlights the specific words for the search engine. ManualsLib naturally also has its own copy. Just for the love of God make sure it matches your laptop (the one in that link should work for 15-eg models as they're just the Intel variant).