BGO detector assembly originally on flange A.
GAGG  "                        "    flange B.

BGO detector, SiPad#3:
+ Showed linear bias response during experiment and was thought to have a short.
  Upon conducting another bias curve post-run, the same behaviour was observed.
  However, when I checked the detector visually, all bond wires seem to be in tact and when I tested the diode response with the multimeter, it behaves as a diode should.
  ^ (potential difference of ~0.4 - 0.8 V when forward-biased, open line--OL--when reverse-biased) ^
  We swapped it onto the other flange/arm to see if the flange is the problem but now cannot apply bias at all to this detector.

BGO detector, crystal:
+ During initial bias curve measurement, the crystal PD would not bias.


+ In trying to bias the BGO detector on the other flange (B) to see if the problem follows the detector or the flange, we were not unable to bias either Mod0Ch2 or Mod1Ch0 (SiPad#3 and SiPad#5).
  The channels were both inconsistently problematic for the GAGG originally on this flange this morning while Maeve did bias curves.
  Perhaps there is an intermittent poor connection on this flange or with the Samtec ribbon cables/end cap PCB/etc.

+ There seems to also be some interdependency between the leakage current on BGO detector SiPad#3 and SiPad#5 - they share a D-Sub.
  The leakage currents of each detector and equal and opposite. We changed the D-Sub to see if that was the problem, but the problem persisted.
  When both are biased simultaneously, leakage currents on each goes to zero. A short between the two might then have them at the same potential in this scenario meaning no applied voltage and no leakage 
  current.
  Visual inspection of these two pads doesn't reveal any obvious problems and both behave like a diode in multimeter tests.

+ We also swapped out the Samtec ribbon cables to investigate any issues with those. When the new spare cable was connected to X2, the crystal PD biased just fine
  This may imply a lose/broken connection on that cable that prevented the crystal being biased. However, this had no impact on SiPad#3 and #5.


GAGG detector assembly
+ Cannot bias SiPad#4 on either flange. This detector also shows open line in both directions when doing a diode test with a multimeter. (MSPAD 16A)
  Upon further investigation, the corner of the chip near Ch1 is no longer bonded to the PCB and lifting. This will likely have broken the bond wire on the rear.
  Will be boxed and left for Jan to take to the detector workshop for further investigation.

+ Crystal couldn't be biased originally on flange B, but biased "normally" on flange A. Potentially indicated some connection issue with either flange B or the Samtec cables.
  Considering the previously noted test replacing the Samtec cable X2 in flange B, this suggests the problem may lie with that cable.