Partly refurbished 450s:
003, 006, 007, 010, 011, 013, 014, 024, 025, 026, 027, 028, 030, 031, 035, 036, 040, 073, 074, 076, 086, 087, 093, 099, 102, 105, 109, 110, 117, 124, 126(31 units)
Full refurbishment of trains:
444s:
003, 006*, 007, 010, 015, 019, 020, 025, 029, 033, 034*, 038, 040, 042, 044 & 045*.(13 units completed)(29% complete)
450s:
005, 008, 015, 016, 018, 019, 020, 032, 033, 037, 038, 041, 075, 079, 081, 082, 083, 084, 085, 091, 094, 095*, 097, 100, 103, 106*, 111, 112*, 113, 115, 119, 121, 122(30 units completed)(24% complete)
*currently being done
Let me know if any more trains have been fully refurbished and I will edit this post regularly