On an MX router with MX-MPC2-3D-EQ, logs similar to the following might be seen: 

[MASTER]
user@MX-router_RE0> show log messages | match QX-chip
Jan 2 01:28:49
Jan  1 06:22:23  MX-router_RE0 fpc2 QX-chip(1): scheduler 1 - qdr error address:0x03c0502d data2:0x00000019 data1:0xc0060000 data0:0x005fffff
Jan  1 20:45:11  MX-router_RE0 fpc2 QX-chip(1): scheduler 1 - hw panic - zero weight enqueue
Jan  1 20:45:12  MX-router_RE0 fpc2 QX-chip(1): scheduler 1 - hw panic - zero weight enqueue
Jan  1 20:45:12  MX-router_RE0 re1 MX-router_RE1 re0 MX-router_RE0 fpc2 QX-chip(1): scheduler 1 - hw panic - zero weight enqueue
(snip)

These logs may indicate a transient HW issue with the QX-chip QDR SRAM, which can be cleared by offline/online of the fpc during a maintenance window. There may not be any impact from these messages. 

[MASTER]
user@MX-router_RE0> request chassis fpc slot 2 offline

(wait a minute)

[MASTER]
user@MX-router_RE0> request chassis fpc slot 2 online

[MASTER]
user@MX-router_RE0> show chassis fpc

If there is impact, or if the logs persist after offline/online of the fpc, please contact your JTAC Representative.