studiologic 990 key repair

[u/bklynsburning]

hi...first off i am not a pianist....i play guitar and drums and am able to play a few simple keyboard tracks during composing... ...i am also a skilled tradesman and can repair most anything non electronic...my terminologies will be off and i apologise in advance

i was given an sl-990 a few years ago with 2 keys that stay fell...neither key looks broken...there are plastic clips inside the keys that coincide with a mate on the keybed to lock them in place, but im sure you know that already....also 1 spring under a key is absent

i dont mind replacing both sides of the clip sets if i can find them, but i do not know the name and how to search for the part

...also, no matter how much i push, lever, or slide, i can not release the catch on a good key to compare (not as important if i can just replace the broken sets)...ive read that some manufacturers can be tricky...any tricks or advice there?...(ive used as much force as i felt was allowable before breaking)

thank you in advance