They both work half way into the surround but as soon as you push them all the way in it flickers and is really dim then it just goes off..
Exactly the problem I had, real pain I agree.
Access was my biggest problem for a proper contact clean, hence trying some small cuttings of foil.
...and don`t listen to Neil (Bluese2), most aircraft are lost due to pilot error, not me servicing them 😃