My Grandfather was in 137MU in Malta, and worked away from the airfields bringing severely damaged planes to serviceability, or writing them of and cannibalizing them. He worked on EN973 ( he wrote it off 6/9/42) EP706 BR130 EP135 BR565, all of which I believe are associated with Beurling.
He records great detail about all the work done for each plane, though sometimes it can be hard to decipher the writing. i am happy to post any details if they are of interest. EG BR565 was converted to a VB wing!
As to the question of colours. What would paint codes look like, as he may have recorded.