SGP/SIRS/E31 - Tracker failure

All tracker related datastreams are affected: short_direct_normal (NIP), 
down_short_diffuse_hemispheric (8-48), and possibly the down_long_hemisp_shaded (PIR) although it is not 
apparent in the reviewed data for the affected timeframe.

Data are not recoverable.

• down_long_hemisp_shaded_min
• down_short_diffuse_hemisp_max
• down_short_diffuse_hemisp_std
• inst_down_long_shaded_dome_temp
• down_long_hemisp_shaded
• short_direct_normal_std
• down_long_hemisp_shaded_max
• down_short_diffuse_hemisp
• inst_down_long_shaded_case_temp
• down_long_netir
• short_direct_normal
• down_long_hemisp_shaded_std
• short_direct_normal_max
• down_short_diffuse_hemisp_min
• short_direct_normal_min

• inst_down_long_shaded_case_resist
• inst_down_long_shaded_dome_resist
• inst_direct_normal
• inst_diffuse
• inst_down_long_hemisp_shaded_tp