Before you go in with all guns blazing. Power everything down. Power up store first etc, then finally power up C15 that has disc still ingested. I had a similar problem recently after power outage and my C15 finally returned the disc after being powered up last in the chain. The problem has not repeated.
Hector

AV: Thorens TD160B, SME, ShureV15MK2, 500, 598, 861v4, DSP7200.1, DSP3300HC Samsung UE55, SkyHD.
DINING: MS600, AC200, DSP5200SEUG.
STUDY 504, Roon Nucleus + RevB, 808v6, 5200SE, Mac & PC (Touch Screen), Prime+PS Grado GS1000i
HORIZONTAL: M80, MS200, Red Rose Spirit + Sonus Faber Toys, iPad Mini
A capella to Zydeco